Patent Document

RELATED APPLICATIONS 
   [Not Applicable] 
   FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
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   MICROFICHE/COPYRIGHT REFERENCE 
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   BACKGROUND OF THE INVENTION 
   Passwords are a commonly practiced security measure that prevents unauthorized users from accessing computer systems as well as identifying authorized users during an access. However, unauthorized users have used a variety of measures to ascertain the passwords of authorized users. 
   Once an unauthorized user has obtained an authorized user&#39;s password, the unauthorized user can access the computer system in the same manner as the authorized user. Often times, the unauthorized user accesses the computer system for malicious purposes. The activity of the unauthorized user is generally not detected until significant damage or disruptions have occurred. 
   Requiring authorized users to change their passwords at regular intervals can curtail, at least to some extent, the activities of unauthorized users. However, the regular interval time period is usually several weeks or months. During this time period, an unauthorized user can cause significant damage and disruption. Even if the user changes password daily, it could still not be effective to inhibit unauthorized user to do significant damage and disruption for that duration. 
   As a result, some computer systems use a time varying randomly generated password for each authorized user. The administrator of the computer system provides each authorized user with a device. The device includes a pseudo-random number generator that generates a code at relatively short time intervals, such as every minute. The computer system is also equipped to determine the pseudo-random number at a given time. When the authorized user seeks to access the computer system, the authorized user uses the code generated and displayed by the device as the password. 
   The foregoing provides for quickly changing passwords that are valid for short times. Accordingly, even if an unauthorized user does obtain a password, the password is valid for a very short time period. This significantly curtails the damage that an unauthorized user can do. 
   Nevertheless, such computer networks can still be exposed to unauthorized users. As an additional security precaution, some computer systems also require access by authorized users from a particular client terminal. The particular client terminal is known as a secure terminal and is preferably located in a physically secured location. Accordingly, in order to gain unauthorized access to such a computer network, an unauthorized user would also have to physically breach the physical security at the secured location. 
   An unauthorized user can bypass the physical security at the secured location by gaining remote access to the secure terminal. Accordingly, remote access is usually cut off from the secure terminal. However, cutting off remote access to the terminal generally cuts of all communication between the secure terminal and the outside world, except between the secure terminal and the server for the computer network. This essentially reduces the secure terminal to a dedicated terminal for accessing the computer network. 
   Further limitations and disadvantages of conventional and traditional approaches will become apparent to one of ordinary 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 
   Presented herein are systems and methods for global positioning system based secure access. 
   In one embodiment, there is presented a method for granting access to a computer network. The method comprises receiving a request for access to the computer network; determining whether a mobile terminal is within a predetermined location; granting access to the computer network, if the mobile terminal is within the predetermined location; and denying access to the computer network, if the mobile terminal is outside of the predetermined location. 
   In another embodiment, there is presented an article of manufacture. The article of manufacture comprises a computer readable medium. The computer readable medium stores a plurality of executable instructions. The plurality of executable instructions are for receiving a request for access to the computer network; determining whether a mobile terminal is within a predetermined location; and granting access to the computer network, if the computer terminal is within the predetermined location; denying access to the computer network, if the computer terminal is outside of the predetermined location. 
   In another embodiment, there is presented a communication network for granting access to a computer network. The communication network comprises a server, and a wireless network. The server receives a request for access to the computer network. The wireless server determines the location of the mobile terminal through the communication medium using ‘Global Positioning System (GPS) technique. The server granting access to the computer network is dependent on the location of the mobile terminal. 
   These and other advantages and novel features of the present invention, as well as details of an illustrated embodiment thereof, will be more fully understood from the following description and drawings. 

   
     BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS 
       FIG. 1  is a block diagram of a communication system for providing secure access to a computer network in accordance with an embodiment of the present invention; 
       FIG. 2  is a flow diagram describing the operation of the server in accordance with an embodiment of the present invention; 
       FIG. 3  is a block diagram of an exemplary Global System for Mobile Communication Public Land Mobile Network that can be used in accordance with an embodiment of the present invention; 
       FIG. 4  is a signal flow diagram describing the operation of a communication network in accordance with an embodiment of the present invention; and 
       FIG. 5  is a block diagram describing an exemplary hardware environment where an embodiment of the present invention can be practiced. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring now to  FIG. 1 , there is illustrated a block diagram of an exemplary communication system for configuring a mobile terminal to provide a time varying random password in accordance with an embodiment of the present invention. The system includes a computer network  100  and a wireless network  130 . 
   The computer network  100  includes a server  105  that is accessible over a computer network  100  by a client terminal  115  in a physical location  117 . The computer network  100  is any electronic or optical information distribution network and can comprise any combination of a variety of communication media, such as, but not limited to, the internet, the public switched telephone network, a local area network (LAN), and a wide area network (WAN). 
   The server  105  may provide access to a database storing sensitive information or the like, or allow individuals to perform various transactions. Accordingly, it is important to control access to the server  105 . As a result, the server  105  requires a password from the client terminal  115  that validates the identity of the user at the client terminal  115 . 
   As an additional layer of security, the computer network  100  requires the authorized user to access the computer network  100  from the physical location  117 . The particular physical location  117  is preferably a physically secured location that is not accessible by the general public. When an authorized user attempts to access the computer network  100 , the computer network  100  requests the user to provide a password. Additionally, the computer network  100  uses the wireless network  130 , via terminal  125  to locate the position of a mobile terminal  120  associated with the user. The terminal  125  is a terminal that has access to the wireless network  130 , either directly, or via another network. For example, the terminal  125  can comprises a computer connected to either the wireless network  130  or the public switched telephone network. 
   The computer network  100  grants access to the user, if the user provides the proper password, and the mobile terminal  120  is located in the physical location  117 . 
   It is noted now that an unauthorized user needs, not only an authorized user&#39;s password, but also the ability to place the authorized user&#39;s mobile terminal  120  at the physical location  117  to access the computer network  100 . Furthermore, even if an unauthorized user succeeds in remotely accessing the client terminal  115 , the computer network  100  will not grant the unauthorized user access to the computer network  100 . Accordingly, remote access need not be cut off from the client terminal  115 . This allows the client terminal  115  to be used for other purposes, such as accessing the internet. 
   In one embodiment, as an additional security feature, the computer network  100  can use time varying randomly generated passwords. The time varying randomly generated passwords can be displayed on the mobile terminal  120 . Exemplary systems and methods for the foregoing are described in “INTEGRATION OF SECURE IDENTIFICATION CARDS INTO CELL PHONE”, U.S. application for patent Ser. No. 10/801,470, by Relan, et al., filed Mar. 16, 2004, which is incorporated herein by reference. During access, the authorized user provides the time varying randomly generated password displayed on the mobile terminal  120 . This additional feature virtually assures that the accessing user himself is at the physical location  117 . The mobile terminal  120  can also be integrated into the client terminal  115  for ease of use. 
   Referring now to  FIG. 2 , there is illustrated a block diagram describing the operation of the server  105  in accordance with an embodiment of the present invention. At  155 , the server  105  receives a request for access to the computer network  100 . At  160 , the server  105  requests the password from the user. As noted above, a number of schemes can be used for allocating the password. In one embodiment, the password can be a time varying randomly generated alpha-numeric number. 
   At  165 , the server  105  determines whether the password provided is the correct password. If at  165 , the password provided during  160  is incorrect, the server  105  requests the password again from the user a predetermined number of times. If after the predetermined number of times ( 175 ) the user has failed to provide the correct password, the server  105  denies access ( 180 ). 
   When the user provides the correct password at  165 , the server  105  then requests, via terminal  125 , a wireless network to check ( 185 ) the location of the mobile terminal  120  to determine ( 190 ) if the mobile terminal  120  is located within location  117 . If the mobile terminal  120  is within location  117 , the server  105  grants access ( 195 ) to the authorized user. If the mobile terminal  120  is not within the location  117 , the server  105  denies ( 180 ) access. 
   The server  105  checks the location of the mobile terminal  120  using a wireless network  130 . The wireless network  130  can comprise a variety of communication networks, such as, but not limited to, the Global System for Mobile (GSM) Communications, or the Personal Communication Services (PCS) network, IEEE 802.11 Wireless LAN network, Ethernet etc. 
   Referring now to  FIG. 3  there is illustrated a block diagram of a Global System for Mobile Communication (GSM) Public Land Mobile Network (PLMN)  210 . The PMLN  210  is composed of a plurality of areas  212 , each with a node known as a Mobile Switching Center (MSC)  214  and an integrated Visitor Location Register (VLR)  216  therein. The MSC/VLR areas  212 , in turn, include a plurality of Location Areas (LA)  218 , which are defined as that part of a given MSC/VLR area  212  in which a mobile terminal  120  may move freely without having to send update location information to the MSC/VLR area  212  that controls the LA  218 . Each Location Area  212  is divided into a number of cells  222 . The mobile terminal  220  is the physical equipment, e.g., a car phone or other portable phone, used by mobile subscribers to communicate with the cellular network  210 , each other, and users outside the subscribed network, both wireline and wireless. 
   The MSC  214  is in communication with at least one Base Station Controller (BSC)  223 , which, in turn, is in contact with at least one Base Transceiver Station (BTS)  224 . The BTS is a node comprising the physical equipment, illustrated for simplicity as a radio tower, that provides radio coverage to the geographical part of the cell  222  for which it is responsible. It should be understood that the BSC  223  may be connected to several base transceiver stations  224 , and may be implemented as a stand-alone node or integrated with the MSC  214 . In either event, in one embodiment, the BSC  223  and BTS  224  components, as a whole, are generally referred to as a Base Station System (BSS)  225 . At least one of the MSCs  214  are connected to the public switched telephone network (PSTN). 
   The PLMN Service Area or wireless network  210  includes a Home Location Register (HLR)  226 , which is a database maintaining all subscriber information, e.g., user profiles, current location information, International Mobile Subscriber Identity (IMSI) numbers, and other administrative information. The HLR  226  may be co-located with a given MSC  214 , integrated with the MSC  214 , or alternatively can service multiple MSCs  214 , the latter of which is illustrated in  FIG. 3 . 
   The VLR  216  is a database containing information about all of the mobile terminals  120  currently located within the MSC/VLR area  212 . If a mobile terminal  120  roams into a new MSC/VLR area  212 , the VLR  216  connected to that MSC  214  will request data about that mobile terminal  120  from the HLR database  226  (simultaneously informing the HLR  226  about the current location of the mobile terminal  120 ). Accordingly, if the user of the mobile terminal  120  then wants to make a call, the local VLR  216  will have the requisite identification information without having to re-interrogate the HLR  226 . In the afore-described manner, the VLR and HLR databases  216  and  226 , respectively, contain various subscriber information associated with a given mobile terminal  120 . 
   The GSM PLMN  210  also includes the capabilities of locating a mobile terminal  120 , using what is known as a Global Positioning System (GPS). The GPS uses a number of BTSs  224  in the vicinity of the mobile terminal  120  to determine the physical location of the mobile terminal  120 . Each of the number of BTSs  224  use radio signals to determine the distance of the mobile terminal  120  from each BTS  224 . The BTSs  224  transmit signals to the mobile terminal  120 . Responsive to receiving the signal from the BTSs  224 , the mobile terminal  120  transmits radio signals. The radio signals transmitted by the mobile terminal  120  are indicative of the time that the mobile terminal  120  transmits the signals. Accordingly, the distance between the mobile terminal  120  and the BTSs  224  can be determined from the time delay between the transmission of the signals and the receipt of the signals at the BTSs  224 . A GPS node  236  determines and triangulates the distances from several BTSs  224  to determine the physical location of the mobile terminal  120 . 
   In one embodiment of the present invention, during an attempted access by a user, the computer network  100  requests the GSM PLMN  210  to use the GPS to locate the mobile terminal  120 . Responsive thereto, the GSM PLMN  210  reports the location of the mobile terminal  120  to the computer network  100 . The computer network  100  then determines whether the mobile terminal  120  is within the physical location  117 . If the mobile terminal  120  is within the physical location  117  and the user provides the correct password, the computer network  100  grants access. 
   Referring now to  FIG. 4 , there is illustrated a signal flow diagram describing the operation of the communication system in accordance with an embodiment of the present invention. A user requests access to the computer network  100  by providing a password (signal  405 ) to the server  105  of the computer network  100 . The server  105  then validates the password ( 410 ). Upon validating the password, the server  105  then sends a request (signal  415 ) for the position of the mobile terminal  120  associated with the authorized user, to a GPS node  236  associated with the wireless network  130 . 
   The infrastructure of the wireless network  130  routes the request to an MSC  214  associated with the mobile terminal  120 . The MSC  214  commands (signal  420 ) several BTSs  224  to determine the distance between the said BTS and the mobile terminal  120 . The BTSs  224  transmit radio signals (signal  425 ) to the mobile terminal  120  and receive radio signals (signal  430 ) from the mobile terminal  120 . 
   The radio signals transmitted by the mobile terminal  120  are indicative of the time that the mobile terminal  120  transmits the signals. Accordingly, the distance between the mobile terminal  120  and the BTSs  224  can be determined from the time delay between the transmission of the signals and the receipt of the signals at the BTSs  224 . 
   The BTSs  224  provide the time of receipt of the signals from the mobile terminal  120  to a GPS node  236  (signal  435 ). The GPS node  236  determines and triangulates ( 440 ) the distances from several BTSs  224  to determine the physical location of the mobile terminal  120 . The GPS node  236  then provides the physical location (signal  445 ) of the mobile terminal  120  to the server  105 , via terminal  125 . 
   The server  105  then determines ( 450 ) whether the mobile terminal  120  is within the physical location  117  and denies or grants access, thereon. 
   Referring now to  FIG. 5 , there is illustrated a block diagram of an exemplary server  105  in accordance with an embodiment of the present invention. A CPU  60  is interconnected via system bus  62  to random access memory (RAM)  64 , read only memory (ROM)  66 , an input/output (I/O) adapter  68 , a user interface adapter  72 , a communications adapter  84 , and a display adapter  86 . The input/output (I/O) adapter  68  connects peripheral devices such as hard disc drives  40 , floppy disc drives  41  for reading removable floppy discs  42 , and optical disc drives  43  for reading removable optical disc  44  (such as a compact disc or a digital versatile disc) to the bus  62 . The user interface adapter  72  connects devices such as a keyboard  74 , a mouse  76  having a plurality of buttons  67 , a speaker  78 , a microphone  82 , and/or other user interface devices such as a touch screen device (not shown) to the bus  62 . The communications adapter  84  connects the computer system to a data processing network  92 . The display adapter  86  connects a monitor  88  to the bus  62 . 
   An embodiment of the present invention can be implemented as a file resident in the random access memory  64  of one or more computer systems  58  configured generally as described in  FIG. 5 . Until required by the computer system  58 , the file may be stored in another computer readable memory, for example in a hard disc drive  40 , or in removable memory such as an optical disc  44  for eventual use in an optical disc drive  43 , or a floppy disc  42  for eventual use in a floppy disc drive  41 . The file can contain a plurality of instructions executable by the computer system, causing the computer system to perform various tasks, such effectuating the flow chart described in  FIG. 2 . 
   It is noted that the physical storage of the sets of instructions physically changes the medium upon which it is stored electrically, magnetically, or chemically so that the medium carries computer readable information. 
   While the present invention has been described with reference to certain 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 present invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present invention without departing from its scope. Therefore, it is intended that the present invention not be limited to the particular embodiment disclosed, but that the present invention will include all embodiments falling within the scope of the appended claims.

Technology Category: h