# US 2014/0153723 A1 · System for providing physical layer security > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153723 A1 - Document ID: US20140153723A1 - Status: Published application - Kind: A1 - Application number: 13/908,230 - Filed: 2013-06-03 - Published: 2014-06-05 - Earliest claimed: 2012-06-01 - Assignees: Georgia Tech Research Corporation; Whisper Communications, Inc. - Applicants: Georgia Tech Research Corporation; Whisper Communications, LLC - Inventors: Steven W. McLaughlin; Willie K. Harrison; Jeffrey McConnell; Cenk Argon - Web page: https://patentgrep.com/patent/US20140153723A1 ## CPC - H04W 12/033: of the user plane, e.g. user's traffic - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Systems, devices, and methods of physical layer security are disclosed. One such device includes a physical layer security module and a physical layer processing module. The physical layer security module is operable to transform user data in accordance with security characteristics. The physical layer processing module is operable to process the transformed data into a format suitable for the communication channel and further operable to transmit the processed data onto the communication channel. The security characteristics of the physical layer security module are such that decoding the intercepted user data by the eavesdropper results in a bit error rate of about one-half. ## Claims ### Claim 1 A communication device used on a communication channel, the device comprising: a physical layer security module residing in a physical layer of the device and operable to transform user data in accordance with one or more security characteristics; and a physical layer processing module residing in the physical layer and operable to process the transformed data into a format suitable for the communication channel and further operable to transmit the processed data onto the communication channel, wherein the one or more security characteristics of the physical layer security module are such that decoding the intercepted user data by the eavesdropper results in a bit error rate of about one-half. ### Claim 2 (depends on 1) The device of claim 1, wherein the physical layer processing module is further operable to process the transformed data into a format suitable for the communication channel by performing error correction coding on the transformed data. ### Claim 3 (depends on 1) The device of claim 1, wherein the physical layer security module is further operable to transform the user data by encoding the user data with a secure error correction code. ### Claim 4 (depends on 1) The device of claim 1, wherein further comprising an encryption module operable to encrypt the user data before providing the encrypted user data to the physical layer security module. ### Claim 5 (depends on 1) The device of claim 1, wherein the physical layer security module resides on a first chip and the physical layer processing module resides on a separate second chip. ### Claim 6 (depends on 1) The device of claim 1, wherein the physical layer security module is integrated on a single chip with the physical layer processing module. ### Claim 7 (depends on 1) The device of claim 1, wherein the physical layer security module is located remotely from the physical layer processing module and communicates with the physical layer processing module over a secondary communication channel. ### Claim 8 A system comprising: a transmitter device including a transmitter physical layer security module; and a receiver device including a receiver physical layer security module, the transmitter device being operable to: generate a transmitter security configuration; transmit the transmitter security configuration to the receiver device; configure the transmitter physical layer security module in accordance with the transmitter security configuration; process user data with the transmitter physical layer security module to produce secured data; and transmit the secured data to the receiver device, the receiver device being operable to: receive the transmitter security configuration from the transmitter device; generate receiver configuration data from the received transmitter security configuration; configure a receiver physical layer security module in accordance with the receiver configuration data; and process data received from the transmitter device with the receiver physical layer security module to recover the user data, wherein the transmitter security configuration specifies a configuration of the transmitter physical layer security module such that decoding the secured data as received by an eavesdropper results in a bit error rate of about one-half. ### Claim 9 (depends on 8) The system of claim 8, wherein the transmitter physical layer security module comprises a secure error code encoder and the transmitter security configuration specifies a generator matrix. ### Claim 10 (depends on 8) The system of claim 8, wherein the transmitter physical layer security module comprises a convolutional encoder and the transmitter security configuration specifies a transfer function, a generator matrix, or a combination thereof. ### Claim 11 (depends on 8) The system of claim 8, wherein the transmitter physical layer security module comprises a series of rate-1 recursive convolutional encoders interspersed with one or more bit-level permuters and the transmitter security configuration specifies any combination of a shift register depth, a tap configuration, an adder configuration, and a bit-level permuter configuration. ### Claim 12 A system comprising: a physical layer security transmitter device including a display; and a physical layer security receiver device including a user input device, the transmitter device being operable to: generate a transaction identifier; generate transmitter security configuration from the transaction identifier; present the transaction identifier on the display; configure a transmitter physical layer security module in accordance with the transmitter security configuration; process user data with the transmitter physical layer security module to produce secured data; and transmit the transformed data to the receiver device, the receiver device being operable to: obtain, through the user input device, the transaction identifier; generate inverse transformer configuration data from the obtained transaction identifier; configure a receiver physical layer security module in accordance with the transmitter security configuration; and process data received from the transmitter device with the receiver physical layer security module to recover the user data, wherein the transmitter security configuration specifies a configuration of the transmitter physical layer security module such that decoding the transformed data as received by an eavesdropper results in a bit error rate of about one-half. ### Claim 13 (depends on 12) The system of claim 12, wherein the transmitter physical layer security module comprises a pre-processor and a secure error code encoder. ### Claim 14 (depends on 12) The system of claim 12, wherein the transmitter physical layer security module comprises a secure error code encoder and the transmitter security configuration specifies a generator matrix. ### Claim 15 (depends on 12) The system of claim 12, wherein the transmitter physical layer security module comprises a low density parity code (LPDC) coder and the transmitter security configuration specifies a parity matrix. ### Claim 16 (depends on 12) The system of claim 12, wherein the transmitter physical layer security module comprises a series of rate-1 recursive convolutional encoders interspersed with one or more bit-level permuters and the transmitter security configuration specifies any combination of a shift register depth, a tap configuration, an adder configuration, and a bit-level permuter configuration. ### Claim 17 (depends on 12) The system of claim 12, wherein the transmitter security configuration is expressed as a bit vector. ### Claim 18 A method of securing user data during transmission, the method comprising: generating, by a transmitter device, a transaction identifier; generating, by the transmitter device, a transmitter security configuration from the transaction identifier; securely transmitting, by the transmitter device to a receiver device, the transaction identifier or the transmitter security configuration; configuring, by the transmitter device, a physical layer security module in accordance with the transmitter security configuration; processing, by the transmitter device, user data with the configured transmitter physical layer security module to produce secured data; and transmitting, by the transmitter device to the receiver device, the secured data, wherein the transmitter security configuration specifies a configuration of the transmitter physical layer security module such that decoding the secured data as intercepted by an eavesdropper results in a bit error rate of about one-half. ### Claim 19 (depends on 18) The method of claim 18, wherein the securely transmitting comprises: encrypting the transaction identifier or the transmitter security configuration; and transmitting, by the transmitter device to a receiver device, the encrypted transaction identifier or the encrypted transmitter security configuration. ### Claim 20 (depends on 18) The method of claim 18, wherein the securely transmitting comprises: initially configuring, at the transmitter device, the transmitter physical layer security module in accordance with predefined transmitter security configuration; processing, by the transmitter device, the transmitter security configuration with the initially configured transmitter physical layer security module to produce initial secured data; and transmitting, by the transmitter device to the receiver device, the initial secured data, wherein the transmitter security configuration specifies another configuration of the transmitter physical layer security module such that decoding the initial secured data as intercepted by the eavesdropper results in another bit error rate of about one-half. ### Claim 21 (depends on 20) The method of claim 20, wherein the securely transmitting is performed before the configuring. ### Claim 22 (depends on 20) The method of claim 20, wherein the securely transmitting is performed using at a lower power than used by the transmitting of the secured data. ### Claim 23 (depends on 20) The method of claim 20, wherein the predefined transmitter security configuration is different than the transmitter security configuration.