# US 11,451,538 B2 · Methods and systems of authenticating of personal communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,538 B2 - Document ID: US11451538B2 - Status: Granted - Kind: B2 - Application number: 16/841,619 - Filed: 2020-04-06 - Published: 2020-10-08 - Granted: 2022-09-20 - Earliest claimed: 2019-04-05 - Assignees: University of South Florida - Applicants: University of South Florida - Inventors: Sriram Chellappan; Balaji Padmanabhan; Tanvir Hossain Bhuiyan; Arup Kanti Dey; Shaminur Rahman - Web page: https://patentgrep.com/patent/US11451538B2 ## CPC - H04L 63/0861: {using biometrical features, e.g. fingerprint, retina-scan (cryptographic mechanisms or cryptographic arrangements for entity authentication using biological data H04L9/3231)} - H04L 9/0643: {Hash functions, e.g. MD5, SHA, HMAC or f9 MAC} - H04L 9/0866: {involving user or device identifiers, e.g. serial number, physical or biometrical information, DNA, hand-signature or measurable physical characteristics} - H04L 9/3231: {Biological data, e.g. fingerprint, voice or retina (network architectures or network communication protocols for supporting authentication of entities using biometrical features in a packet data network H04L63/0861)} - H04L 9/3247: {involving digital signatures} - H04L 63/0823: {using certificates (cryptographic mechanisms or cryptographic arrangements for entity authentication involving certificates H04L9/3263)} - H04W 4/029: Location-based management or tracking services - H04W 12/06: Authentication - H04W 12/61: Time-dependent - H04W 12/63: Location-dependent; Proximity-dependent - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A system for authenticating an individual's location activity includes a mobile communications device connected to a network and in electronic communication with at least one other computer. The mobile communications device is configured to authenticate the individual's presence at a location using biometric data entered by the individual. The mobile communications device has applications stored thereon to access location information for the mobile communications device using a GPS application stored on the mobile communications device and to access time information for the mobile communications device from a clock application stored on the mobile communications device. The mobile communications devices creates a digital signature that authenticates an individual's location activity by storing an encrypted digital certificate comprising a hash calculation using the biometric data, a validation key generated by authenticating the biometric data, the location information, and the time information. ## Claims ### Claim 1 A system for authenticating an individual's location activity, comprising: a mobile communications device connected to a network and in electronic communication with authentication protocol software stored on a server connected to the network; using the authentication protocol software to send a communication to the mobile device, the communication comprising a message configured to elicit a response comprising a same message back from the mobile device; the mobile communications device comprising a processor, memory connected to the processor, and additional software stored in the memory configured to: receive the communication from the server and receive the same message entered into the mobile device by the individual; receive biometric data entered by the individual as an input into the mobile communications device; access location information for the mobile communications device using a GPS application stored on the mobile communications device; access time information for the mobile communications device from a clock application stored on the mobile communications device; periodically record sounds from an environment around the mobile communications device, wherein the sounds are not biometric data entered by the individual; storing on the mobile communications device an encrypted digital certificate comprising a hash calculation using the response, the sounds, the biometric data, a validation key, the location information, and the time information; transmitting the digital certificate to the authentication protocol software and verify the encrypted digital certificate at the server with the validation key. ### Claim 2 (depends on 1) A system according to claim 1, wherein the biometric data is voice data. ### Claim 3 (depends on 2) A system according to claim 2, wherein verifying the voice data comprises accessing a voice authentication application on the mobile communications device or on the server. ### Claim 4 (depends on 3) A system according to claim 3, wherein the voice authentication application comprises a pre-recorded voice sample. ### Claim 5 (depends on 3) A system according to claim 3, wherein the voice authentication application is in electronic communication with a remote server processing voice authentication services, and wherein the voice authentication services access a pre-recorded voice sample of the individual created using the mobile communications device. ### Claim 6 (depends on 1) A system according to claim 1, further comprising forming an encrypted digital signature for the individual's location activity after verifying the digital certificate at the server. ### Claim 7 (depends on 1) A system of claim 1, further comprising providing audio or video content data from the mobile device back to the server in the response. ### Claim 8 (depends on 1) A system of claim 1, further comprising accessing a hashing algorithm with the mobile communications device through an application program interface stored on the mobile communications device.