Abstract:
A secure communication channel between first and second radio frequency communication devices is indicated by the synchronized indicators on each of the two devices. The indicator may be a light or speaker. After a secure channel is established, the indicators may be simultaneously operated so that a user may definitively and positively determine that the two devices are securely connected to each other. Any interloper devices would not be indicating on the same pattern and thereby be identified.

Description:
BACKGROUND 
       [0001]    Many devices connect to each other using radio frequency communications. Several protocols and standards, including Bluetooth, can be used to establish secure communications between two devices. For example, a cellular telephone may establish a secure communication channel with a wireless headset to enable hands-free operation of the cellular telephone. 
         [0002]    Because of the ubiquitous nature of wireless devices, there is an opportunity for security breaches as several devices may operate in the same general vicinity and in the same frequency space. Interloper devices may intentionally or unintentionally establish a connection with a user&#39;s device and breach the user&#39;s security. 
         [0003]    As devices become more miniaturized, the user interface for the device becomes very limited. For example, today&#39;s wireless headsets may have a button that is used for on/off power as well as other functions for the headset. The other interfaces may be an indicator light, a microphone, and a speaker. There is often no place for a user interface display with text, graphics, or other visual indicator, and sometimes there is very limited space for input devices such as switches. When such a limited user interface exists, it is difficult to positively communicate the status of a communication session. 
       SUMMARY 
       [0004]    A secure communication channel between first and second radio frequency communication devices is indicated by the synchronized indicators on each of the two devices. The indicator may be a light or speaker. After a secure channel is established, the indicators on both connected devices may be simultaneously operated so that a user may definitively and positively determine that the two devices are securely connected to each other. Any interloper devices would not be indicating on the same pattern and thereby be identified. 
         [0005]    This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    In the drawings, 
           [0007]      FIG. 1  is a pictorial illustration of an embodiment showing a system with connected devices having synchronized indicators. 
           [0008]      FIG. 2  is a timeline diagram of an embodiment showing a sequence for secure communications with synchronized indicators. 
           [0009]      FIG. 3  is a diagrammatic illustration of an embodiment showing devices with secure communications and synchronized indicators. 
       
    
    
     DETAILED DESCRIPTION 
       [0010]    Specific embodiments of the subject matter are used to illustrate specific inventive aspects. The embodiments are by way of example only, and are susceptible to various modifications and alternative forms. The appended claims are intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the claims. 
         [0011]    Throughout this specification, like reference numbers signify the same elements throughout the description of the figures. 
         [0012]    When elements are referred to as being “connected” or “coupled,” the elements can be directly connected or coupled together or one or more intervening elements may also be present. In contrast, when elements are referred to as being “directly connected” or “directly coupled,” there are no intervening elements present. 
         [0013]    The subject matter may be embodied as devices, systems, methods, and/or computer program products. Accordingly, some or all of the subject matter may be embodied in hardware and/or in software (including firmware, resident software, micro-code, state machines, gate arrays, etc.) Furthermore, the subject matter may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this document, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. 
         [0014]    The computer-usable or computer-readable medium may be, for example but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or propagation medium. By way of example, and not limitation, computer readable media may comprise computer storage media and communication media. 
         [0015]    Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by an instruction execution system. Note that the computer-usable or computer-readable medium could be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted, of otherwise processed in a suitable manner, if necessary, and then stored in a computer memory. 
         [0016]    Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. The term “modulated data signal” means a signal that has one or more of its characteristics set or changed in such a manner as to encode information in the signal. By way of example, and not limitation, communication media includes wired media such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared and other wireless media. Combinations of the any of the above should also be included within the scope of computer readable media. 
         [0017]    When the subject matter is embodied in the general context of computer-executable instructions, the embodiment may comprise program modules, executed by one or more systems, computers, or other devices. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Typically, the functionality of the program modules may be combined or distributed as desired in various embodiments. 
         [0018]      FIG. 1  is a diagram of an embodiment  100  showing a system where devices in secure communication mode are able to synchronize indicators. The telephone handset  102  is wirelessly connected to a wireless headset  104 . The telephone handset  102  has a display  105 , a speaker  106 , and an indicator light  108 . The wireless headset  104  has a button  110 , a speaker  112  located on the far side of the device, and an indicator light  114 . The telephone handset  102  and the wireless headset  104  are connected using a secure wireless connection  116 . 
         [0019]    When two devices, in this case the telephone handset  102  and the wireless headset  104 , are connected using a secure wireless connection  116 , an indicator on each device may be operated in a synchronized mode as a positive indication that a secure communications link is established between the two devices. For example, the indicator light  108  on the telephone  102  may blink in synchronization with the indicator light  114  of the headset  104 . In another embodiment, the speaker  106  on the telephone  102  may make a sound in synchronization with the indicator light  114  or a sound played on the speaker  112 . 
         [0020]    When a user establishes a secure wireless connection between the two devices, the user may check that the secure connection exists by looking or listening to the two devices near each other. If the two devices are indicating in unison, a secure connection is established. If the devices are not indicting in unison, one or both devices may be in communication with a third device. Such a device may be an interloper device that may maliciously intercept a communication, or just may be inadvertently connected. In either event, the user may experience difficulties if the two devices that were intended to be connected were, in fact, not connected. 
         [0021]    Visual or audible indicators that are operated in synchronization are an easily understandable mechanism for a person to verify connectivity. The user merely has to view or listen to both devices simultaneously in order to know beyond a doubt that the two devices are properly connected. Such an indication transcends language and cognitive abilities, and may be universally understood. 
         [0022]    The synchronized mode of the indicators may be a steady pulsating beat, a changing beat or other rhythmic pattern, or may be a random indication. The more complex an indication is, the less likely an interloper or other third device may be able to mimic the pattern and thus the user may have more confidence that the devices were properly connected. 
         [0023]    In some embodiments, the indicators may operate simultaneously, while in other embodiments, the indicators may operate alternatively. A simultaneous operation is one in which both indicators indicate at the same time and for the same duration. An alternative indication is one in which one indicator is on while the other is off, and vise versa. 
         [0024]    The devices may be any type of wireless device that can provide a secure connection. In some embodiments, such as Bluetooth, the devices are arranged in a master/slave relationship. In other embodiments, the devices may be arranged in a peer-to-peer relationship. The wireless connection may be with radio transceivers, infrared transceivers, ultrasonic transceivers, or any other wireless communication protocol. The various protocols to which a synchronized indicator light may apply includes Bluetooth (IEEE 802.15.1), IrDA, IEEE 802.11, WiMax (IEEE 802.16), or any other wireless communication protocol. 
         [0025]    The devices particularly suited for the synchronized indicators are those that have very limited user interfaces. For example, some Bluetooth enabled headsets have only a multi-function button and a multi-function indicator light. By synchronizing the indicators of two devices through the wireless connection, a positive indication of connection may be assured with a crude user interface. Some devices, such as a laptop computer or a telephone handset may have complex graphical displays. When such a display is available, a graphical button or flashing indicator may be shown on the display in addition to or instead of a separate, dedicated indicator light or speaker. 
         [0026]    In some situations, one indicator on a device may be an audio indicator while the indicator on the other device may be an audio or other multimedia indicator. In the present embodiment  100 , a user may attach the wireless headset  104  to an ear and establish the secure connection  116 . When the connection is secure, the headset  104  may play a beep sound that starts and stops in unison with the indicator light  108  on the telephone  102 . In some embodiments, the indicator may continue to indicate in unison with the other indicator during the entire connection. In other embodiments, especially when an audio indicator is used, an indicator may operate for a predetermined amount of time or the user may be able to mute or otherwise disable the indicator. 
         [0027]      FIG. 2  is a communication sequence embodiment  200  showing a sequence for secure communications with synchronized indicators. The communications between device  202  and device  204  are illustrated. Devices  202  and  204  may be any type of devices capable of wireless communication, examples of which may be the telephone handset  102  and the wireless headset  104 ′. 
         [0028]    Device  202  requests communication  206  with device  204 , then communication is established  208 . The devices may enter a secure mode  210  once initial communications are established. The particular protocol used for requesting and establishing communications between two devices may vary greatly, and many different protocols may be used. In some embodiments, the secure mode may be inherent in the initial communication  208 , while in other embodiments, a secure mode may be a second and discrete step. 
         [0029]    After secure communications are established, device  202  may send an indicator pattern  212  to device  204 . The devices  202  and  204  may operate their respective indicators based on the pattern. 
         [0030]    In some embodiments, the pattern may be transmitted before communications are established. For example, an indicator pattern or sequence may be established as part of the communications protocol. An instance may be a pulsating indicator pattern or another repeated or rhythmic pattern that is defined within the communications protocol. 
         [0031]    In other embodiments, the pattern may be transmitted from device  202  to device  204  in real time. An example may be a random pattern that is communicated from a master device to a slave device, where the slave device turns on and off an indicator in response to real time input from the master device along the communications path. 
         [0032]      FIG. 3  is a diagrammatic illustration of an embodiment  300  showing two devices capable of secure communications and having synchronized indicators. A master device  302  and a slave device  304  are connected through secure wireless communications  306 . The master device  302  comprises a radio transceiver  308  with an antenna  310 , and a processor  312  that may control a visual indicator  314  and an audio indicator  316 . The slave device  304  comprises a radio transceiver  318  with an antenna  320 , and a processor  322  that may control a visual indicator  324  and an audio indicator  326 . 
         [0033]    The embodiment  300  is an example of a system that uses a radio protocol that requires a master and slave relationship. An example of such a protocol is Bluetooth. Each protocol may have different terms and techniques for establishing communications and for creating a secure communication. Other protocols, such as IEEE 802.11, may use a peer-to-peer type relationship between the devices. In a master/slave relationship, the master device  302  may define certain parameters or perform certain functions in creating, managing, and destroying the communication channel. 
         [0034]    In some embodiments, a device may have one or both of a visual indicator and/or an audio indicator. The visual indicators  314  and  324  may be a single light such as a light emitting diode (LED) that is operated in an on/off fashion or with variable intensity. Other visual indicators may include a monochromatic or color display with text, graphics, and other images. The audio indicators may be low quality piezo-electric buzzers, high quality speakers, or any other audio emitting device. 
         [0035]    Each device may have a processor  312  and  322 . The processor  312  and  322  may be microprocessors capable of executing a set of commands stored in a memory device. The memory device may be reprogrammable or otherwise changeable in some instances, while in other instances the memory device may be a read only memory (ROM). The processors  312  and  322  may also be a state machine, application specific integrated circuit (ASIC), or any other circuit or device that performs a specific function. 
         [0036]    The processors  312  and  322  may be integrated into and perform some of the communication functions of the radio transceivers  308  and  318 . 
         [0037]    The foregoing description of the subject matter has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the subject matter to the precise form disclosed, and other modifications and variations may be possible in light of the above teachings. The embodiment was chosen and described in order to best explain the principles of the invention and its practical application to thereby enable others skilled in the art to best utilize the invention in various embodiments and various modifications as are suited to the particular use contemplated. It is intended that the appended claims be construed to include other alternative embodiments except insofar as limited by the prior art.