Patent Publication Number: US-8126434-B2

Title: Secure user interface in a shared resource environment

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS/INCORPORATION BY REFERENCE 
     This patent application is a continuation of U.S. patent application Ser. No. 12/724,236, filed Mar. 15, 2010, issuing Feb. 22, 2011 as U.S. Pat. No. 7,894,796; which is a continuation of U.S. patent application Ser. No. 10/875,883, filed Jun. 24, 2004, now U.S. Pat. No. 7,706,777; which makes reference to, claims priority to and claims benefit from U.S. provisional patent application Ser. No. 60/505,277, filed Sep. 23, 2003, and titled “SECURE USER INTERFACE IN A SHARED RESOURCE ENVIRONMENT.” The contents of each of the above-mentioned applications are hereby incorporated herein by reference in their entirety. This patent application is related to U.S. patent application Ser. No. 10/885,404, titled “MULTIPLE DEVICE ACCESS WINDOWING DISPLAY”, filed Jul. 6, 2004; U.S. patent application Ser. No. 10/874,680, now U.S. Pat. No. 7,724,279; U.S. patent application Ser. No. 12/774,482, titled “OS/APPLICATION BASED MULTIPLE DEVICE ACCESS WINDOWING DISPLAY”, filed May 5, 2010; and U.S. patent application Ser. No. 10/874,636, titled “MULTIPLE DECODE USER INTERFACE”, filed Jun. 23, 2004. 
    
    
     FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     [Not Applicable] 
     SEQUENCE LISTING 
     [Not Applicable] 
     MICROFICHE/COPYRIGHT REFERENCE 
     [Not Applicable] 
     BACKGROUND OF THE INVENTION 
     A dynamic communication network may include a variety of systems and devices that may freely enter and leave the network. For example, a first device may move within range of a wireless communication network and become part of the communication network. A second device may, for example, move out of range of the wireless communication network and exit the communication network. A third device may, for example, exit from a sleep state and resume operation within the communication network. 
     Various devices in a dynamic communication network may, for example, communicate with a plurality of other systems or devices in the network. Such communication may, for example, occur sequentially or concurrently. For example, a wireless keyboard resource may enter a wireless communication network and communicate with a desktop computing system. A mouse keyboard resource may, for example, also enter the wireless communication network and also communicate with the desktop computing system. A laptop computing system may, for example, enter a wireless communication network and communicate with a video display resource. 
     Various systems and/or devices may communicate sensitive information with other devices in a dynamic communication network. For example, a user of a first system may utilize various system resources to process or present sensitive information (e.g., company proprietary or confidential information). 
     Further limitations and disadvantages of conventional and traditional approaches will become apparent to one of skill in the art, through comparison of such systems with the present invention as set forth in the remainder of the present application with reference to the drawings. 
     BRIEF SUMMARY OF THE INVENTION 
     Various aspects of the present invention provide a system and method for providing a secure user interface in a shared resource environment. Various aspects of the present invention may comprise establishing a first wireless communication link between a first system and a shared system resource (e.g., a user interface system). A first wireless communication port may, for example, establish such a wireless communication link. 
     A first secure communication pathway may be established between the first system and the user interface system. A first secure communication module may, for example, establish such a secure communication pathway. The first secure communication pathway may, for example, extend between the first system and a user interface device (e.g., a video display device or window thereof) of the user interface system. 
     The first secure communication pathway may, for example, comprise decrypting encrypted information immediately prior to the use of such information. Such decrypted information may, for example, be stored in a secure memory module or may not be stored in a memory module at all. For example, in a video display scenario, encrypted video information may be decrypted immediately prior to utilizing such information to drive a video display, or decrypted video information may be stored in a secure memory module that may only be accessed by video display driving circuitry. Aspects of the first secure communication pathway may, for example, comprise controlling data echoing functionality along the first secure communication pathway. 
     A second wireless communication link may be established between a second system and the user interface system. A second wireless communication port may, for example, establish such a wireless communication link. 
     A second communication pathway may be established between the second system and the user interface system. A second communication module may, for example, establish such a communication pathway. The second communication pathway may, for example, extend between the second system and the user interface system. The second communication pathway may, for example, extend between the second system and a user interface device (e.g., a video display device or a window thereof) of the user interface system. 
     The second communication pathway may, for example, comprise a second secure communication pathway, which may be established by a second secure communication module. The second secure communication pathway may, for example, be securely isolated from the first secure communication pathway. Alternatively, for example, the second secure communication pathway may be communicatively coupled to the first secure communication pathway. Such communicative coupling may, for example, be implemented by sharing encryption key information between the first secure communication pathway and the second secure communication pathway. Such communicative coupling may, for example, be implemented by transcribing (e.g., using a transcription module) between information encoded with a first encryption key and information encoded with a second encryption key. 
     Various aspects of the present invention may comprise performing various authorization and authentication activities to determine whether the first and/or second systems may access the user interface system, and whether the first and second secure communication pathways may be communicatively coupled. The user interface system may, for example, comprise a secure access module to perform such authorization and authentication activities. 
     These and other advantages, aspects and novel features of the present invention, as well as details of illustrative aspects thereof, will be more fully understood from the following description and drawings. 
    
    
     
       BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  is a flow diagram illustrating an exemplary method for providing a secure user interface in a shared resource environment, in accordance with various aspects of the present invention. 
         FIG. 2  is a flow diagram illustrating an exemplary method for establishing a second communication pathway, in accordance with various aspects of the present invention. 
         FIG. 3  is a diagram showing an exemplary system for providing a secure user interface in a shared resource environment, in accordance with various aspects of the present invention. 
         FIG. 4  is a diagram showing an exemplary system for providing a secure user interface in a shared display resource environment, in accordance with various aspects of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  is a flow diagram illustrating a method  100  for providing a secure user interface in a shared resource environment, in accordance with various aspects of the present invention. The method  100  begins at step  110 . Various events and conditions may cause the method  100  to begin. For example, a user may request that a first system utilize a shared resource in a dynamic communication network. Alternatively, for example, the first system may automatically perform such utilization. In an exemplary scenario, a user may carry a first system in range of a shared resource in a dynamic wireless communication network, and the first system may automatically initiate communications with the shared resource. Generally, the method  100  may be initiated for a variety of reasons. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of particular initiating events or conditions. 
     The following discussion will focus on an exemplary scenario wherein the shared system resource is a user interface system (e.g., a video display system). However, the scope of various aspects of the present invention should not be limited by characteristics of a user interface system. 
     The method  100 , at step  120 , may comprise the user interface system (e.g., a video display system) establishing a first wireless communication link with a first system. The first wireless communication link may, for example, utilize any of a variety of standard and proprietary wireless communication protocols and techniques. For example, the first wireless communication link may utilize wireless RF or optical communication media. For example and without limitation, such a wireless communication link may be based on IEEE 802.11, 802.15, Bluetooth, Ultra Wideband (UWB), etc. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of a particular communication medium, technique or protocol. 
     The first system may comprise any of a large variety of systems and devices. For example and without limitation, the first system may comprise a video device, audio device, data device, user input device, user output device, etc. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of a particular type of first system. 
     The method  100 , at step  130  may, for example, comprise the user interface system establishing a first secure communication pathway between the first system and a user interface device of the user interface system. A user interface device may, for example, comprise a video display device, sound generating device, or any of a variety of devices with which a user and system may communicate information. In an exemplary scenario comprising a video display device, the first secure communication pathway may extend between the first system and an output screen of the video display device. Also for example, the first secure communication pathway may extend between the first system and one or more windows output on the output screen of the video display device. 
     The first secure communication pathway may generally comprise an information path from a source device to a destination device through which information may flow securely (e.g., the information may flow without being accessed by an unauthorized user or system). Such a secure communication pathway may comprise a variety of characteristics, examples of which are discussed below. 
     For example and without limitation, a secure communication pathway may utilize encryption to protect information from being accessed by unauthorized systems. Also, for example, a secure communication pathway may decrypt encrypted information immediately prior to using the information. Such just-in-time decryption reduces exposure of non-encrypted information. For example, in a user interface system, user interface information may be decrypted immediately prior to utilizing the decrypted user interface information with a user interface device. Such decrypted information may then be erased immediately after use. In an exemplary scenario involving a video display system, encrypted video information may be decrypted immediately prior to using the decrypted video information to drive an output display device. 
     Additionally, for example, in a scenario where decrypted information must be stored in memory, the secure communication pathway may utilize secure memory. Such secure memory may, for example, not be accessible by devices that are not a part of the secure communication pathway. For example, in a user interface system, decrypted user interface information may be stored in a secure memory that is not accessible by devices outside of the user interface system. Also for example, in an exemplary video display system, decrypted video information may be stored in a secure display buffer that is only readable by display driving circuitry of the video display system. 
     The secure communication pathway may, for example, include controlling the security of one-way or two-way communications. For example, various system components may utilize data echoing techniques to ensure reliable communications. Various components of a secure communication pathway may eliminate or manage such data echoing activities so that non-encrypted information is not exposed to entities outside of the secure communication path. 
     Additionally, for example, step  130  may comprise utilizing various protocols to determine whether to form the first secure communication pathway between the first system and the user interface device. For example, step  130  may comprise the user interface system and the first system communicating to determine whether one or both of the systems have a particular level of secure communication capability. For example, the user interface system may determine that the first system is not capable of maintaining a particular level of security. In such an exemplary scenario, the user interface system may terminate execution of the method  100 . 
     Additionally, for example, step  130  may comprise performing various authorization and authentication activities to determine whether the user interface system and/or the first system (or user thereof) are authorized to establish the first secure communication pathway. Such an authorization determination may also, for example, include determining whether the first system desires read access and/or write access to the user interface system. For example, a first system that is only interested in transmitting information to an output device may be subject to less authorization and/or authentication scrutiny than a first system that is interested in acquiring information from the user interface system. In an exemplary scenario involving a video display system, step  130  may allow any first system to communicate secure video information to the video display system, but only allow a select set of first systems to retrieve information from the video display system. 
     In general, step  130  may, for example, comprise establishing a first secure communication pathway between the first system and a shared resource (e.g., a user interface device of a user interface system). Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of particular secure communication pathway architectures, methods or traits. 
     The method  100 , at step  140 , may comprise the user interface system (e.g., a video display system) establishing a second wireless communication link with a second system. Such a wireless communication link may, for example, be similar to the wireless communication link established between the user interface system and the first system at step  120 . The second wireless communication link may, for example, utilize any of a variety of standard and proprietary wireless communication protocols and techniques. For example, the first wireless communication link may utilize wireless RF or optical communication media. For example and without limitation, such a wireless communication link may be based on IEEE 802.11, 802.15, Bluetooth, Ultra Wideband (UWB), etc. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of a particular communication medium, technique or protocol. 
     The second system may comprise any of a large variety of systems and devices. For example and without limitation, the first system may comprise a video device, audio device, data device, user input device, user output device, etc. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of a particular type of second system. 
     The method  100 , at step  150 , may comprise establishing a second communication pathway between the second system and the user interface system. The second communication pathway may, for example, comprise a non-secure and/or secure communication pathway. The second communication pathway may, for example, share various characteristics with the first secure communication pathway discussed previously with regard to step  130 . The following discussion regarding the method  200  illustrated in  FIG. 2  will illustrate various aspects of a second communication pathway and the establishment thereof. However the scope of various aspects of the present invention should not be limited by the following exemplary aspects. 
       FIG. 2  is a flow diagram illustrating an exemplary method  200  for establishing a second communication pathway between a shared resource (e.g., a user interface system and/or video display system) and a second system, in accordance with various aspects of the present invention. The method  200  may, for example, share various aspects with step  150  of the method  100  illustrated in  FIG. 1  and discussed previously. As mentioned previously, the method  200  is exemplary. Accordingly, characteristics of the exemplary method  200  should not limit the scope of various aspects of the present invention. 
     The method  200  begins at step  210 . The method  200  may be initiated by a variety of conditions and circumstances. For example, the method  200  may be initiated by the establishment of a wireless communication link between a user interface system and a second system (e.g., as discussed previously with regard to step  140  of the method  100  illustrated in  FIG. 1 ). The method  200  may, for example, be initiated manually or automatically. For example, a shared resource and/or a second system may be pre-programmed to automatically initiate the method  200  upon establishing a wireless communication link. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of particular initiating events or conditions. 
     The following discussion will focus on an exemplary scenario wherein the shared system resource is a user interface system (e.g., a video display system). However, the scope of various aspects of the present invention should not be limited by characteristics of a particular shared resource (e.g., a user interface system or a particular example thereof). 
     The method  200 , at step  220 , may, for example, comprise the user interface system receiving a request from a second system for a communication pathway between the user interface system, or component thereof, and the second system. Such a request may, for example, comprise a request for an independent non-secure communication pathway, a request for an independent secure communication pathway, or a request for a secure communication pathway linked to a pre-existing secure communication pathway (also referred to herein as a “common communication pathway”). An example of such a pre-existing secure communication pathway may comprise the first secure communication pathway formed in step  130  of the method  100  illustrated in  FIG. 1  and discussed previously. 
     The method  200 , at step  230 , may comprise determining whether the second communication pathway is to comprise an independent (or separate) communication pathway or a linked (or common) communication pathway. Step  230  may, for example, make such a determination based on the request received at step  220 . Alternatively, for example, step  230  may make such a determination based on operating conditions or predefined behavior. Accordingly, the scope of various aspects of the present invention should not be limited by a particular method or mechanism by which step  230  makes the determination. 
     If step  230  determines that the second communication pathway is to comprise an independent (or separate) communication pathway between the second system and the user interface system (or component thereof), then method  200  execution flows to step  240 . If step  230  determines that the second communication pathway is to comprise a common communication pathway between the second system and a pre-existing communication pathway of the user interface system, then method  200  execution flows to step  250 . 
     The method, at step  240 , determines whether the second separate communication pathway is to comprise a secure communication pathway or non-secure communication pathway. Step  240  may, for example, make such a determination based on the request received at step  220 . Alternatively, for example, step  240  may make such a determination based on operating conditions or predefined behavior. Accordingly, the scope of various aspects of the present invention should not be limited by a particular method or mechanism by which step  240  makes the determination. 
     If step  240  determines that the second separate communication pathway is to comprise a secure communication pathway, then the method  200  execution flows to step  242 . If step  240  determines that the second separate communication pathway is to comprise a non-secure communication pathway, then the method  200  execution flows to step  244 . 
     The method  200 , at step  242 , may comprise establishing an independent secure communication pathway between the user interface system and the second system. That is, step  242  may establish a second secure communication link that is generally not communicatively coupled to a pre-existing first secure communication link. 
     Step  242  may, for example, comprise various general aspects of establishing a secure communication pathway. Exemplary illustrations of various aspects were provided previously with regard to the discussion of step  130  of the method  100  illustrated in  FIG. 1 . Step  242  may comprise none, a subset, all or a superset of the previously discussed secure communication pathway aspects. 
     For example, in an exemplary scenario where the user interface system comprises a video display system, step  220  may receive a request for an independent secure communication pathway between the second system and a display device of the video display system (e.g., to a dedicated window of the display device). In such a scenario, step  230  may determine that an independent communication pathway is to be established, and method  200  execution may flow to step  240 . Step  240  then may determine that a secure communication pathway is to be established, and method  200  execution may flow to step  242 . Step  242  may then establish an independent secure communication pathway between the display device (or a window thereof) and the second system. 
     For example and without limitation, in an exemplary scenario, a first system may be communicatively coupled to a first window of a display device with a first secure communication pathway, and a second system may be communicatively coupled to a second window of the display device with a second secure communication pathway, where the first and second secure communication pathways are securely isolated from each other. 
     The method  200 , at step  244 , may comprise establishing an independent non-secure (or standard) communication pathway between the user interface system and the second system. For example, in an exemplary scenario where the user interface system comprises a video display system, step  220  may receive a request for an independent non-secure communication pathway between the second system and a display device of the video display system (e.g., to a dedicated window of the display device). In such a scenario, step  230  may determine that an independent communication pathway is to be established, and method  200  execution may flow to step  240 . Step  240  may then determine that a non-secure communication pathway is to be established, and method  200  execution may flow to step  244 . Step  244  may then establish an independent non-secure communication pathway between the display device (or a window thereof) and the second system. 
     For example and without limitation, in an exemplary scenario, a first system may be communicatively coupled to a first window of a display device with a first secure communication pathway, and a second system may be communicatively coupled to a second window of the display device with a second non-secure communication pathway, where the first secure communication pathway is securely isolated from the second non-secure communication pathway. 
     The method  200 , at step  250 , determines whether the second system and/or user thereof is authorized to establish a secure communication pathway between the second system and the user interface system that is linked to (e.g., communicatively coupled with) a first secure communication pathway already existing in the user interface system. Step  250  may, for example, make such a determination based on the request received at step  220 . Alternatively, for example, step  250  may make such a determination based on operating conditions or predefined behavior. Accordingly, the scope of various aspects of the present invention should not be limited by a particular method or mechanism by which step  250  makes the determination. 
     If step  250  determines that the second system and/or user thereof is not authorized to establish a communication pathway that is linked to a first secure communication pathway, then the method  200  execution flows to step  254 , where execution of the method  200  may terminate. If step  250  determines that the second system and/or user thereof is authorized to establish a communication pathway that is linked to a first secure communication pathway, then the method  200  execution flows to step  252 . 
     Step  250 , in determining whether the second system and/or user thereof are authorized to establish the common secure communication pathway may comprise analyzing any of a large variety of secure access conditions. The following discussion will present a non-limiting set of exemplary analyses. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of any secure access conditions or the processing thereof. 
     Step  250  may, for example, comprise determining whether access by the second system and/or user thereof to the user interface system or a component thereof is authorized. For example, the user interface system may comprise a variety of secure access conditions that only allow particular systems or particular users to establish a communication pathway with the user interface system. For example and without limitation, step  250  may comprise performing user authentication utilizing any of a large variety of methods or mechanisms, such as, user ID and password protection, retinal scan identification, finger print identification, biorhythm identification, facial identification, voice identification, etc. Step  250  may, for example, compare the identity of the second system and/or user thereof to a list of authorized entities with which a communication pathway may be established. 
     Note that communication pathway authentication may be dependent on a particular component of the user interface system. For example, in an exemplary scenario involving a video display device, step  250  may determine that a particular second system is authorized for access to a display component of the user interface system but is not authorized for access to a memory device of the user interface system. 
     Step  250  may, for example, comprise determining whether access by the second system and/or user thereof to the first secure communication pathway is authorized. For example and without limitation, a first system, with which the first secure communication pathway is established, may communicate secure access information with the user interface system. For example, the first system may communicate a list of other systems and/or users that are authorized to establish a communication pathway that is communicatively coupled to the first secure communication pathway. Alternatively, for example, the first system may maintain a list of authorized systems and/or users, and the user interface system may forward an access request to the first system, which then provides an indication to the user interface system of whether the access request should be granted or denied. 
     Step  250  may, for example, comprise determining whether the second system has a particular secure communication capability. For example, for a second system to be provided with a second communication pathway that is communicatively coupled to a first secure communication pathway, the second system may be required to have a particular secure communication capability. For example, the second system may be required to implement a particular encryption/decryption method. Also for example, the second system may be required to manage data echoing in a particular manner. Additionally, for example, the second system may be required to only store information obtained from the first secure communication pathway in an encrypted format. Generally, step  250  may, for example, comprise determining whether the second system handles secure information and/or the communication of secure information in an appropriate manner. 
     In an exemplary scenario, a first system, with which the user interface system is communicating using a first secure communication pathway, may indicate to the user interface system the secure communication capability that a second system must have to be allowed to establish a communication pathway that is communicatively coupled to the first secure communication pathway. Alternatively, for example, the user interface system may communicate information of the second system&#39;s secure communication capability to the first system for the first system to analyze and indicate to the user interface system whether the second system is authorized to establish the communication pathway. 
     Step  250  may, for example, comprise determining whether the second system and/or user thereof desires the ability to obtain information from the user interface system and/or from the first secure communication pathway. For example and without limitation, step  250  may comprise determining whether the second system desires to obtain information from the user interface system. Obtaining information from the user interface system and/or the first secure communication pathway may require a relatively high level of authorization and security. Alternatively, for example, providing information to the user interface system and/or the first secure communication pathway may require a different level of authorization and security. 
     The previous discussion presented exemplary secure access analyses that step  250  may comprise. As mentioned previously, however, the scope of various aspects of the present invention should by no means be limited by characteristics of the exemplary secure access analyses discussed previously. 
     The method  200 , at step  252 , may comprise establishing a second secure communication pathway that is linked to (e.g., communicatively coupled with) a first secure communication pathway. Step  252  may, for example, comprise forming the second secure communication pathway. Step  252  may, for example, comprise various general aspects of establishing a secure communication pathway. Exemplary illustrations of such aspects were provided previously with regard to the discussion of step  130  of the method  100  illustrated in  FIG. 1 . Step  252  may comprise none, a subset, all or a superset of the previously discussed aspects. 
     Step  252  may comprise linking (e.g., communicatively coupling) the second secure communication pathway to a first secure communication pathway. Step  252  may, for example, communicatively couple the second secure communication pathway to the first secure communication pathway in any of a variety of ways. For example and without limitation, step  252  may comprise sharing encryption key information. For example, in a scenario where the first secure communication pathway utilizes a first encryption key, the first system or the user interface system may communicate information of the first encryption key to the second system. 
     Also for example, step  252  may comprise transcribing between information encrypted with a first encryption key and information encrypted with a second encryption key. For example, in a scenario where the first secure communication pathway comprises information encrypted with a first encryption key, and the second secure communication pathway comprises information encrypted with a second encryption key, step  252  may comprise transcribing between information encrypted with the first encryption key and information encrypted with the second key. In such an exemplary scenario, the first and second secure communication pathways may be communicatively coupled while being based on respective and different encryption keys. 
     In an exemplary scenario where the user interface system comprises a video display system, step  220  may receive a request for a shared secure communication pathway between a second system and a display device of the video display system (e.g., to a common window of the display device), where the shared secure communication pathway is to be communicatively coupled to a pre-existing first secure communication pathway that extends between the display device and a first system. In such an exemplary scenario, step  230  may determine that a common secure communication pathway is to be established, and method  200  execution may flow to step  250 . Step  250  may then determine that the second system and/or user thereof is authorized to establish a second secure communication pathway that is communicatively coupled to the first secure communication pathway, and method  200  execution may flow to step  252 . Step  252  may then establish a second secure communication pathway between the display device (or a window thereof) and the second system and communicatively couple the second secure communication pathway to the first secure communication pathway. 
       FIG. 3  is a diagram showing an exemplary system  300  providing a secure user interface in a shared resource environment, in accordance with various aspects of the present invention. The exemplary system  300  may comprise a user interface system  310  as an exemplary shared resource. However, the user interface system  310  example should by no means limit the scope of various aspects of the present invention to embodiments comprising a user interface system. The exemplary system  300  may also, for example, comprise a first system  360  and a second system  370 . 
       FIG. 4  is a diagram showing an exemplary system  400  for providing a secure user interface in a shared video display resource environment, in accordance with various aspects of the present invention. The exemplary system  400  may, for example, share various aspects with the exemplary system  300  illustrated in  FIG. 3 , albeit in the context of a shared video display resource environment. The following discussion will generally focus on the exemplary system  300  shown in  FIG. 3  and will occasionally refer to aspects of the exemplary system  400  shown in  FIG. 4  to present contextualized examples. 
     The user interface system  310  may comprise a first communication port  315  and a second communication port  320 . The user interface system  310  may comprise a first secure communication module  330  communicatively coupled to the first communication port  315 , and a second communication module  335  communicatively coupled to the second communication port  320 . The user interface system  310  may also, for example, comprise a secure access module  350 , transcription module  345  and a secure memory module  346 . The user interface system  310  may further comprise a user interface device  340 . 
     Various components of the user interface system  310  may be grouped or combined in various physical components. For example and without limitation, the first communication port  315  and second communication port  320  may be combined in a single aggregate communication port  325 . Also for example, the first secure communication module  330 , second communication module  335 , secure access module  350 , transcription module  345  and secure memory module  346  may be combined in a single aggregate module  355 . Such an aggregate communication port  325  and aggregate module  355  may, for example, be integrated on respective integrated circuits or on a single integrated circuit. Also, various aspects of the aforementioned modules and components may be implemented in hardware, software, and various combinations thereof. Accordingly, the scope of various aspects of the present invention should not be limited by boundaries between various modules or details of particular implementations. 
     The first communication port  315  may, for example, establish a first wireless communication link with the first system  360 . The first communication port  315  may, for example, implement various aspects of step  120  of the method illustrated in  FIG. 1  and discussed previously. 
     The first communication port  315  may establish a wireless communication link with the first system  360  utilizing any of a variety of standard and proprietary wireless communication protocols and techniques. For example, the wireless communication link may utilize wireless RF or optical communication media. Additionally, for example, the first communication port  315  may establish a wireless communication link based on various standard and proprietary communication protocols (e.g., IEEE 802.11, 802.15, Bluetooth and Ultra Wideband (UWB)). Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of a particular communication medium, technique or protocol. 
     The first system  360  may comprise any of a large variety of systems and devices. For example and without limitation, the first system  360  may comprise a video device, audio device, data device, user input device, user output device, etc. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of a particular type of first system  360 . 
     Referring to  FIG. 4 , the first communication port  415  may, for example, establish a first wireless communication link (e.g., a wireless video information link) with the first system  460 . The first system  460  may, for example comprise any device that provides video information to be displayed. For example, and without limitation, the first system  460  may comprise a video camera, a laptop computer, a DVD player, a desktop computing system, a personal digital assistant, etc. The first system  460  may provide video information to the first communication port  415  over the first wireless communication link. 
     Referring back to  FIG. 3 , the first secure communication module  330  may, for example, establish a first secure communication pathway between the first system  360  and the user interface device  340 . The user interface device  340  may, for example, comprise a video display device, sound generating device, or any of a variety of devices with which a user and system may communicate information. 
     Referring to  FIG. 4 , in an exemplary scenario where the user interface device  440  comprises a video display device  442 , the first secure communication pathway may extend between the first system  460  and the output screen of the video display device  442 . Also for example, the first secure communication pathway may extend between the first system  460  and a first window  443  (or plurality of windows) output on the screen of the video display device  442 . 
     Referring back to  FIG. 3 , as mentioned previously, the first secure communication pathway may generally comprise an information path from a source device to a destination device through which information may flow securely (e.g., the information may flow without being accessed by an unauthorized user or system). Such a secure communication pathway may comprise a variety of characteristics, examples of which are discussed below. The examples discussed below may share various aspects with exemplary secure communication pathway characteristics discussed previously with regard to the method  100  illustrated in  FIG. 1 . 
     For example and without limitation, the first secure communication module  330  may utilize encryption and decryption to protect information from being accessed by an unauthorized system. For example, the first secure communication module  330  may decrypt encrypted information immediately prior to using the information. For example, in the exemplary user interface system  310 , the first secure communication module  330  may decrypt user interface information in the first secure communication pathway immediately prior to utilizing the decrypted user interface information with the user interface device  340 . The first secure communication module  330  may then, for example, purge the decrypted user interface information from the first secure communication module  330  and any other component of the user interface system  310 . 
     In a scenario where decrypted information must be stored in memory, the first secure communication module  330  may utilize a secure memory module  346  to store the decrypted information. The secure memory module  346 , for example, may not be accessible by devices that are not part of the first secure communication pathway. Also for example, the secure memory module  346  may not be accessible by devices that are not part of a particular portion of the first secure communication pathway (e.g., a portion of the first secure communication pathway communicationally downstream from the secure memory module  346 ). 
     Referring to  FIG. 4 , the first secure communication module  430  may, for example, decrypt video information received from the first system  460  immediately prior to providing the decrypted video information to the display driver  441 . The display driver  441  may then utilize the decrypted video information to drive the display device  442 . In a scenario where decrypted information must be stored in memory, the first secure communication module  460  may, for example, store decrypted video information in the secure memory module  446 , which may subsequently be provided to the display driver  441 . 
     Referring back to  FIG. 3 , the first secure communication module  330  may, for example, control the security of one-way or two-way communications. For example, various system components may utilize data echoing techniques to ensure reliable communications, thereby potentially creating two-way communication of sensitive information. Various components of a secure communication pathway, including the first secure communication module  330 , may eliminate or manage such data echoing activities so that non-encrypted information is not exposed to entities outside of the secure communication pathway. 
     Additionally, for example, the first secure communication module  330  may utilize various protocols to determine whether to form the first secure communication pathway between the first system  360  and the user interface device  340 . For example, the first secure communication module  330  may communicate with the first system  360  to determine whether one or both of the systems have a particular level of secure communication capability. For example, the first secure communication module  330  may determine that the first system  360  is not capable of maintaining a particular level of security. In such an exemplary scenario, the first secure communication module  330  may deny the first system  360  a secure communication pathway to the user interface system  310  or a component thereof. 
     Additionally, for example, the first secure communication module  330  may utilize the secure access module  350  to determine whether the user interface system  310  and/or the first system  360  (or user thereof) are authorized to establish the first secure communication pathway. The secure access module  350  may, for example, determine whether the first system  360  desires read access and/or write access to the user interface system  310 . For example, the secure access module  350  may subject a first system  360  that is only interested in transmitting information to the user interface device  340  to less authorization and/or authentication scrutiny than a first system  360  that is interested in acquiring information from the user interface system  310 . 
     In general, the first secure communication module  330  may establish a first secure communication pathway between the first system  360  and a shared resource (e.g., the user interface device  340  of the exemplary user interface system  310 ). Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of particular secure communication pathway architectures, methods or traits. 
     The second communication port  320  may establish a second wireless communication link with the second system  370 . The second communication port  320  may, for example, share various aspects with the first communication port  315 . The second communication port  320  may establish the second wireless communication link with the second system  370  utilizing any of a variety of standard and proprietary wireless communication protocols, media and techniques. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of a particular communication medium, technique or protocol. 
     The second system  370 , similar to the first system  360 , may comprise any of a large variety of systems and devices. For example and without limitation, the second system may comprise a video device, audio device, data device, user input device, user output device, etc. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of a particular type of second system  370 . 
     The second communication module  335  may establish a second communication pathway between the second system  370  and the user interface system  310 . The second communication module  335  may, for example, implement various aspects of the method steps  150  and  210 - 260  discussed previously and illustrated in  FIGS. 1-2 . The second communication module  335  may, for example, share various aspects with the first communication module  330  discussed previously. 
     The second communication pathway may, for example, comprise a non-secure and/or secure communication pathway. The second communication pathway may, for example, share various characteristics with the first secure communication pathway discussed previously with regard to the method step  130  illustrated in  FIG. 1 . 
     The second communication module  335  may establish the second communication pathway in response to any of a variety of conditions or circumstances. For example, the second communication module  335  may establish the second communication pathway in response to a request from the second system  370  over the second wireless communication link. Also, for example, the second communication module  335  may establish the second communication pathway automatically and/or in response to a pre-programmed set of instructions. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of particular initiating events or conditions. 
     The second communication module  335  may, for example, receive a request from the second system  370  for a communication pathway between the user interface system  310 , or a component thereof, and the second system  370 . Such a request may, for example, comprise a request for an independent non-secure communication pathway, a request for an independent secure communication pathway, or a request for a secure communication pathway linked to a pre-existing secure communication pathway (also referred to herein as a “common communication pathway”). An example of such a pre-existing secure communication pathway may comprise the above-mentioned exemplary first secure communication pathway between the first system  360  and the user interface device  340  established by the first secure communication module  330 . 
     The second communication module  335  may determine whether the second communication pathway is to comprise an independent (or separate) communication pathway or a linked (or common) communication pathway. The second communication module  335  may, for example, make such a determination based on a request received from the second system  370 . Alternatively, for example, the second communication module  335  may make such a determination based on operating conditions or predefined behavior. Accordingly, the scope of various aspects of the present invention should not be limited by a particular method or mechanism by which the second communication module  335  makes the determination. 
     If the second communication module  335  determines that the second communication pathway is to comprise an independent secure communication pathway between the second system  370  and the user interface system  310  (or component thereof), then the second communication module  335  may establish such an independent secure communication pathway. For example and without limitation, the second communication module  335  may perform various aspects of steps  130 ,  150  and  242  of the methods  100  and  200  illustrated in  FIGS. 1-2  and discussed previously. 
     Referring to  FIG. 4 , in an exemplary scenario, the second communication module  435  may receive a request for an independent secure communication pathway between the second system  470  and the display device  442  of the video display system  440  (e.g., to a dedicated second window  444  of the display device). In response to such a request, the second communication module  435  may, for example, utilize the secure access module  450  to determine whether the second system  470  and/or user thereof is authorized for such a communication pathway. If the second system  470  and/or user thereof is authorized, the second communication module  435  may establish the requested independent secure communication pathway between the second system  470  and the display device  442  (or a second window  444  thereof). In such an exemplary scenario, the first system  460  may be communicatively coupled to the first window  443  of the display device  442  with a first secure communication pathway, and the second system  470  may be communicatively coupled to the second window  444  of the display device  442  with a second secure communication pathway, where the first and second secure communication pathways are securely isolated from each other. 
     Referring back to  FIG. 3 , if the second communication module  335  determines that the second communication pathway is to comprise an independent non-secure communication pathway between the second system  370  and the user interface system  310  (or component thereof), then the second communication module  335  may establish such a communication pathway. For example and without limitation, the second communication module  335  may perform various aspects of steps  150  and  244  of the methods  100  and  200  illustrated in  FIGS. 1-2  and discussed previously. 
     Referring to  FIG. 4 , in an exemplary scenario where the user interface system  410  comprises a video display system  440  having a display device  442 , the second communication module  435  may receive a request for an independent non-secure communication pathway between the second system  470  and the display device  442  (e.g., to a dedicated window  444  of the display device  442 ). In response to such a request, the second communication module  435  may, for example, utilize the secure access module  450  to determine whether the second system  470  and/or user thereof is authorized for such a communication pathway. If the second system  470  is authorized, the second communication module  435  may establish the requested independent non-secure communication pathway between the second system  470  and the display device  442  (or second window  444  thereof). 
     For example and without limitation, in an exemplary scenario, the first system  460  may be communicatively coupled to a first window  443  of the display device  442  with a first secure communication pathway, and the second system  470  may be communicatively coupled to a second window  444  of the display device  442  with a second non-secure communication pathway, where the first secure communication pathway is securely isolated from the second non-secure communication pathway. 
     Referring back to  FIG. 3 , if the second communication module  335  determines that the second communication pathway is to comprise a shared (or common) secure communication pathway between the second system  370  and the user interface system  310  (or component thereof), then the second communication module  335  may establish such a communication pathway. 
     For example, the second communication module  335  may utilize the secure access module  350  to determine whether the second system  370  and/or user thereof is authorized to establish a secure communication pathway between the second system  370  and the user interface system  310  that is linked to (e.g., communicatively coupled with) a first secure communication pathway in the user interface system  310 . The secure access module  350  may, for example, make such a determination based on a request received by the second communication module  335  from the second system  370 . Alternatively, for example, the secure access module  350  may make such a determination based on operating conditions or predefined behavior. Accordingly, the scope of various aspects of the present invention should not be limited by a particular apparatus, method or mechanism by which the second communication module  335  and/or secure access module  350  makes the determination. 
     If the secure access module  350  determines that the second system  370  and/or user thereof is not authorized to establish a communication pathway that is linked to a first secure communication pathway, then the second communication module  335  may, for example, terminate communications with the second system  370  or may, for example, offer the second system  370  a different type of communication pathway. If the secure access module  350  determines that the second system  370  and/or user thereof is authorized to establish a communication pathway that is linked to a first secure communication pathway, then the second communication module  335  may establish such a communication pathway. 
     The secure access module  350 , in determining whether the second system  370  and/or user thereof are authorized to establish the common secure communication pathway may analyze any of a large variety of secure access conditions. The following discussion will present a non-limiting set of exemplary secure access analyses. Accordingly, the scope of various aspects of the present invention should not be limited by characteristics of any secure access conditions or the processing thereof. 
     The secure access module  350  may, for example, determine whether access by the second system  370  and/or user thereof to the user interface system  310  and/or a component thereof is authorized. For example, the user interface system  310  may comprise a variety of secure access conditions that only allow particular systems or particular users to establish a communication pathway with the user interface system. For example and without limitation, the secure access module  350  may determine user authentication utilizing any of a large variety of methods or mechanisms, such as, user ID and password protection, retinal scan identification, finger print identification, biorhythm identification, facial identification, voice identification, etc. The secure access module  350  may, for example, compare the identity of the second system  370  and/or user thereof to a list of authorized entities with which a communication pathway may be established. 
     Note that communication pathway authentication may be dependent on a particular component of the user interface system  310 . For example, in an exemplary scenario where the user interface device  340  comprises a video display device and a memory device, the secure access module  350  may determine that a particular second system  370  is authorized for access to the video display device but is not authorized for access to a memory device of the user interface device  340 . 
     The secure access module  350  may, for example, determine whether access by the second system  370  and/or user thereof to the first secure communication pathway is authorized. For example and without limitation, a first system  360 , with which the first secure communication pathway is established, may communicate secure access information with the secure access module  350 . For example, the first system  360  may communicate a list of other systems and/or users that are authorized to establish a communication pathway that is communicatively coupled to the first secure communication pathway. Alternatively, for example, the first system  360  may maintain a list of authorized systems and/or users, and the secure access module  350  may forward an access request to the first system  360 , which then provides an indication to the secure access module  350  of whether the access request should be granted or denied. The secure access module  350  may, for example, perform any of a variety of authorization and authentication activities, some of which were discussed previously. 
     The secure access module  350  may, for example, determine whether the second system  370  has a particular secure communication capability. For example, for the second system  370  to be provided with a second communication pathway that is communicatively coupled to a first secure communication pathway, the second system  370  may be required to have a particular secure communication capability. For example, the second system  370  may be required to implement a particular encryption/decryption method. Also for example, the second system  370  may be required to manage data echoing in a particular manner. Additionally, for example, the second system  370  may be required to only store information obtained from the first secure communication pathway in an encrypted format. Generally, the secure access module  350  may, for example, determine whether the second system  370  manages secure information and/or the communication of secure information in an appropriate manner. 
     In an exemplary scenario, a first system  360 , with which the user interface system  310  is communicating using a first secure communication pathway, may indicate to the secure access module  350  the secure communication capability that the second system  370  must have to be allowed to establish a communication pathway that is communicatively coupled to the first secure communication pathway. Alternatively, for example, the secure access module  350  may communicate information of the second system&#39;s secure communication capability to the first system  360  for the first system  360  to analyze and indicate to the secure access module  350  whether the second system  370  is authorized to establish the communication pathway. 
     The secure access module  350  may, for example, determine whether the second system  370  and/or user thereof desires the ability to obtain information from the user interface system  310  and/or from the first secure communication pathway. For example and without limitation, the secure access module  350  may determine whether the second system  370  desires to obtain information from the user interface system  310 . Obtaining information from the user interface system  310  and/or the first secure communication pathway may require a relatively high level of authorization and security. Alternatively, for example, providing information to the user interface system  310  and/or the first secure communication pathway may require a different level of authorization and security. 
     The previous discussion presented exemplary secure access analyses that the second communication module  335  and/or the secure access module  350  may perform. As mentioned previously, however, the scope of various aspects of the present invention should by no means be limited by characteristics of the exemplary secure access analyses discussed previously. 
     If the second communication module  335  determines (e.g., by utilizing the secure access module  350 ) that the second system  370  is authorized to have a second secure communication pathway that is communicatively coupled to the first secure communication pathway, then the second communication module  335  may link the first and second secure communication pathways. For example, the second communication module  335  may communicatively couple the second secure communication pathway (e.g., between the user interface system  310  or component thereof and the second system  370 ) and the first secure communication pathway (e.g., between the user interface system  310  or component thereof and the first system  360 ). 
     Referring to  FIG. 4 , in an exemplary scenario where the user interface system  410  comprises a video display system  440  having a display device  442 , the second communication module  435  may receive a request for a secure communication pathway between the second system  470  and the display device  442  that is linked to a pre-existing secure communication pathway (e.g., a first secure communication pathway between the first system  460  and the first window  443  of the display device  442 ). In such a scenario, the second communication module  435  may respond to such a request by utilizing the secure access module  450  to perform a secure access check to determine whether the second system  470  and/or user thereof is authorized for establishing such a common communication pathway. If the second system  470  is authorized, then the second communication module  435  may establish the requested common communication pathway. 
     Referring back to  FIG. 3 , the second communication module  335  may, for example, establish a second secure communication pathway that is linked to (e.g., communicatively coupled with) a first secure communication pathway. In establishing such a communication pathway, the second communication module  335  may, for example, perform various general operations related to establishing a secure communication pathway. Exemplary illustrations of such operations were provided previously with regard to the discussion of steps  130 ,  150  and  252  of the methods  100 ,  200  illustrated in  FIGS. 1-2 . 
     The second communication module  335  may, for example, link (e.g., communicatively couple) the second secure communication pathway to a first secure communication pathway. The second communication module  335  may, for example, communicatively couple the second secure communication pathway to the first secure communication pathway in any of a variety of ways. For example and without limitation, the second communication module  335  may share encryption key information. For example, in a scenario where the first secure communication pathway utilizes a first encryption key, the first system  360  or the second communication module  335  may communicate information of the first encryption key to the second system  370 . 
     Also for example, the second communication module  335  may utilize the transcription module  345  to transcribe between information encrypted with a first encryption key and information encrypted with a second encryption key. For example, in a scenario where the first secure communication pathway comprises information encrypted with a first encryption key, and the second secure communication pathway comprises information encrypted with a second encryption key, the transcription module  345  may transcribe between information encrypted with the first encryption key and information encrypted with the second key. In such an exemplary scenario, the first and second secure communication pathways may be communicatively coupled while being based on respective and different encryption keys. 
     Referring to  FIG. 4 , in an exemplary scenario where the user interface system  410  comprises a video display system  440  having a display device  442 , the second communication module  435  may receive a request for a shared secure communication pathway between the second system  470  and the first window  443  of the display device  442 , where the shared secure communication pathway is to be communicatively coupled to a pre-existing first secure communication pathway that extends between the first window  443  of the display device  442  and the first system  460 . In such an exemplary scenario, the second communication module  435  may respond to such a request by utilizing the secure access module  450  to determine whether the second system  470  is authorized for such a communication pathway. If the second system  470  is authorized for such a communication pathway, then the second communication module  435  may establish a second secure communication pathway between the second system  470  and the first window  443  of the display device  442 . Establishing such a second secure communication pathway may, for example, comprise communicatively coupling the second secure communication pathway to the first secure communication pathway. 
     As mentioned previously, in general, the various modules and components discussed in the previous discussion may, for example be implemented in hardware, software, or a combination thereof. For example and without limitation, the various modules discussed previously may be integrated in a single integrated circuit, or may, for example, be implemented utilizing a processor executing software or firmware instructions. Accordingly, the scope of various aspects of the present invention should by no means be limited by characteristics of particular hardware or software utilizations or implementations of various aspects of the present invention. 
     In summary, aspects of the present invention provide a system and method for a secure user interface in a shared resource environment. While the invention has been described with reference to certain aspects and embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.