# US 10,321,310 B1 · Secure authentication of mobile devices using sensor transfer of keying material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,321,310 B1 - Document ID: US10321310B1 - Status: Granted - Kind: B1 - Application number: 13/909,709 - Filed: 2013-06-04 - Granted: 2019-06-11 - Earliest claimed: 2013-06-04 - Assignees: Rockwell Collins, Inc. - Applicants: Rockwell Collins, Inc. - Inventors: James L. Scheer; Raymond A. Kamin - Web page: https://patentgrep.com/patent/US10321310B1 ## CPC - H04W 12/06: Authentication - H04L 63/061: {for key exchange, e.g. in peer-to-peer networks (cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838)} - H04L 63/08: {for authentication of entities (cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32)} - H04W 12/04: Key management, e.g. using generic bootstrapping architecture [GBA] - H04L 63/18: {using different networks or channels, e.g. using out of band channels (cryptographic mechanisms or cryptographic arrangements for key distribution involving distinctive intermediate devices or communication paths H04L9/0827; cryptographic mechanisms or cryptographic arrangements for authentication using a plurality of channels H04L9/3215)} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A system and method are disclosed for use of a passive sensor within a mobile device as a separate authentication mechanism to exchange a secure key with a desired network. A network access point presents an encoded bit stream via an audio signal over an audio channel or a video signal within a video presentation. Each signal type is configured for reception by a passive sensor on the mobile device. This received information would be used to generate the private key within the mobile device for encrypting the wireless communication channel. Only mobile devices within audio or visual range of the presentation may be authenticated and thus securely connected to the network. ## Claims ### Claim 1 A method for establishing a secure data connection, comprising: presenting or transmitting, using a first communication medium, audio authentication key information from a network connection access point of a host network to a mobile device, the audio authentication key information comprising a private key or information for generating the private key for a secure data connection, wherein the audio authentication key information comprises first authentication key information; presenting second authentication key information, wherein the second authentication key information is communicated from the network connection access point to the mobile device using a sequence of images presented on a display; receiving, using a passive sensor of the mobile device, the audio authentication key information from the first communication medium, the receiving comprising a one-way communication, the mobile device further configured for two-way communication between the network connection access point and the mobile device using a second communication medium, the second communication medium separate or distinct from the first communication medium; sending, using the second communication medium, a request for the secure data connection from the mobile device, the sending occurring upon receipt of the audio authentication key information and upon obtaining of the private key using the mobile device, the request including the private key to connect the mobile device with the host network over the secure data connection; encrypting, using the private key, data communicated between the network connection access point and the mobile device to establish the secure data connection; and tracking an activity of a user through the mobile device during use of the secure data connection, wherein the first communication medium is configured for transmission of an audio signal, the audio authentication key information is communicated from the network connection access point to the mobile device using an encoded bit stream transmitted within the audio signal, and the audio signal has a frequency of 20 KHz or more, wherein the host network is an avionics network onboard an aircraft, wherein receiving, using a passive sensor of the mobile device, the audio authentication key information further comprises receipt of the audio authentication key information by a microphone from a power limited audio signal. ### Claim 2 (depends on 1) The method of claim 1, wherein the first authentication key information is communicated using the first communication medium, the first communication medium comprises an audio signal transmitted to a microphone of the mobile device, the passive sensor comprising the microphone, and wherein different authentication key information of the first authentication key information and the second authentication key information is interchangeably transmitted or presented after a time interval. ### Claim 3 (depends on 1) The method of claim 1, wherein receiving, using a passive sensor of the mobile device, the audio authentication key information further comprises using a processor and an application of the mobile device to determine the private key from the audio authentication key information. ### Claim 4 (depends on 3) The method of claim 3, wherein an extension to an operating system of the processor provides at least in-part a capability for the determining of the private key. ### Claim 5 (depends on 1) The method of claim 1, wherein the network connection access point is a wireless router connected to the host network. ### Claim 6 A system for establishing a secure data connection, comprising: a host network; a network connection access point configured for: presenting or transmitting audio authentication key information to a passive sensor of a mobile device using a first communication medium, the audio authentication key information comprising a private key or information for generating the private key for a secure data connection, wherein the audio authentication key information comprises first authentication key information; presenting second authentication key information, wherein the second authentication key information is communicated from the network connection access point to the mobile device using a sequence of images presented on a display; connecting the host network with the mobile device using a second communication medium, the second communication medium being separate or distinct from the first communication medium a, wherein the separation or distinction at least comprises being configured for two-way communication; receiving a request for the secure data connection from the mobile device upon receipt at the mobile device of the authentication key information and upon obtaining of the private key using the mobile device, the request including the private key to connect the mobile device with the host network over the secure data connection, the receiving the request using the second communication medium; and encrypting data communicated between the network connection access point and the mobile device using the private key to establish the secure data connection, wherein the host network is configured to track an activity of a user through the mobile device during use of the secure data connection, wherein the first communication medium is configured for transmission of an audio signal, the audio authentication key information is communicated from the network connection access point to the mobile device using an encoded bit stream transmitted within the audio signal, and the audio signal has a frequency of 20 KHz or more, wherein the host network is an avionics network onboard an aircraft, wherein the mobile device is configured for passive reception, the passive reception comprising receiving the audio authentication key information using the passive sensor of the mobile device and further comprising positional-based or vicinity-based reception of the audio authentication key information within an aircraft hull, and wherein the aircraft hull and a range of the first communication medium separates the audio authentication key information from receivers outside the aircraft hull. ### Claim 7 (depends on 6) The system of claim 6, wherein the first authentication key information is communicated using the first communication medium by an audio signal transmitted to a microphone of the mobile device, the passive sensor comprises the microphone, and different or altered authentication key information of the first authentication key information and the second authentication key information is interchangeably presented or transmitted after a time interval. ### Claim 8 (depends on 6) The system of claim 6, wherein the mobile device is configured for using a processor and an application of the mobile device for receiving the audio authentication key information and requesting the data connection. ### Claim 9 (depends on 6) The system of claim 6, wherein an extension to an operating system within the mobile device provides at least in-part a capability for the determining of the private key from the audio authentication key information. ### Claim 10 An apparatus for establishing a secure data connection between a mobile device and a host network, comprising: a network connection access point associated with an aircraft and configured for: presenting first and second authentication key information to a mobile device within the aircraft using a first communication medium and a second communication medium, the first authentication key information comprising a first private key or first information for generating the first private key for a secure data connection and the second authentication key information comprising a second private key or second information for generating the second private key for the secure data connection, the presenting a one way communication to the mobile device through the first communication medium using an auditory signal and through the second communication medium using a sequence of images presented on a display; connecting the host network with the mobile device using a third communication medium, the third communication medium being separate or distinct from the first communication medium and the second communication medium; receiving a first request for the secure data connection from the mobile device upon receipt of the first authentication key information at the mobile device and upon obtaining of the private key using the mobile device, the receiving the first request using the third communication medium, the first request including the first private key; receiving a second request for the secure data connection from the mobile device upon receipt of the second authentication key information at the mobile device and upon obtaining of the private key using the mobile device, the receiving the second request using the third communication medium, the second request including the second private key; and encrypting data communicated between the network connection access point and the mobile device over the secure data connection using at least one of the first private key and the second private key, wherein the host network is configured to track an activity of a user through the mobile device during use of the secure data connection, wherein the first communication medium is configured for transmission of an audio signal, the audio authentication key information is communicated from the network connection access point to the mobile device using an encoded bit stream transmitted within the audio signal, and the audio signal has a frequency of 20 KHz or more, wherein the host network is an avionics network onboard an aircraft, wherein the mobile device is configured for passive reception, the passive reception comprising receiving the audio authentication key information using the passive sensor of the mobile device and further comprising positional-based or vicinity-based reception of the audio authentication key information within an aircraft hull, and wherein the aircraft hull and a range of the first communication medium separates the audio authentication key information from receivers outside the aircraft hull.