# US 2023/0267221 A1 · Pin-level encryption for electrical systems > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0267221 A1 - Document ID: US20230267221A1 - Status: Published application - Kind: A1 - Application number: 18/307,491 - Filed: 2023-04-26 - Published: 2023-08-24 - Earliest claimed: 2019-08-06 - Assignees: Red Balloon Security, Inc. - Applicants: Red Balloon Security, Inc. - Inventors: Ang Cui - Web page: https://patentgrep.com/patent/US20230267221A1 ## CPC - G06F 21/6209: {to a single file or object, e.g. in a secure envelope, encrypted and accessed using a key, or with access control rules appended to the object itself} - G06F 21/602: {Providing cryptographic facilities or services} - G06F 21/606: {by securing the transmission between two devices or processes} - G06F 21/72: in cryptographic circuits - G06F 21/107: {License processing; Key processing} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A system and method of providing pin-level encryption to low-information signals is provided. The system comprises a first system communicatively coupled to a second system. The first system comprises a signal generator configured to generate a signal having a complexity and a mixer circuit configured to receive a key, create a secured message by applying the key to the signal, and transmit the secured message to the second system. The secured message has a complexity that is higher than the complexity of the signal. ## Claims ### Claim 1 A system comprising: a first system communicatively coupled to a second system, the first system comprising: a signal generator configured to generate a signal having a first complexity; and a mixer circuit configured to receive a key, create a secured message by applying the key to the signal, and transmit the secured message to the second system, wherein the secured message has a complexity that is higher than the first complexity of the signal. ### Claim 2 (depends on 1) The system of claim 1, wherein a new key is received by the mixer circuit for each subsequent signal from the signal generator. ### Claim 3 (depends on 1) The system of claim 1, wherein the first system comprises a hardware root of trust. ### Claim 4 (depends on 1) The system of claim 1, further comprising an emanator communicatively coupled to the first system and the second system and configured to provide the key to the first system and the second system. ### Claim 5 (depends on 4) The system of claim 4, wherein the first system further comprises an antenna, and wherein the first system is configured to receive the key from the emanator over a wireless connection. ### Claim 6 (depends on 4) The system of claim 4, wherein the emanator and the second system are connected over a wired connection, and the second system is configured to receive the key over the wired connection. ### Claim 7 (depends on 6) The system of claim 6, wherein the second system is configured to extract the signal from the secured message using the key received from the emanator. ### Claim 8 (depends on 1) The system of claim 1, wherein the first system is an embedded system, the second system is an embedded system, or a combination of both. ### Claim 9 (depends on 1) The system of claim 1, wherein the mixer circuit comprises a set of non-transitory machine-readable instructions executable by a processor of the first system. ### Claim 10 (depends on 1) The system of claim 1, wherein the mixer circuit comprises a pin tap on an output pin of the first system. ### Claim 11 (depends on 10) The system of claim 10, wherein the signal comprises a low-information analog signal. ### Claim 12 (depends on 10) The system of claim 10, wherein the signal comprises a low-information digital signal. ### Claim 13 (depends on 1) The system of claim 1, wherein the signal comprises a digital low-information signal, and the first system further comprising a DAC device configured to convert the digital low-information signal into an analog low-information signal. ### Claim 14 (depends on 13) The system of claim 13, wherein the mixer circuit comprises an analog mixer circuit, and applying the key comprises mixing the analog low-information signal with the key. ### Claim 15 (depends on 1) The system of claim 1, wherein the mixer circuit is disposed within a substrate. ### Claim 16 A method comprising: generating, by a first system, a first signal having a first complexity; applying, by the first system, a first key to the first signal to generate a first secured message having a second complexity based on the first key; and transmitting, by the first system, the first secured message to a second system; wherein the first complexity of the first signal is lower than the second complexity of the first secured message. ### Claim 17 (depends on 16) The method of claim 16, further comprising: generating, by the first system, a second signal, the second signal and the first signal comprising the same data; and applying, by the first system, a second key to the second signal to generate a second secured message, wherein the first key is different from the first key such that the second secured message is different from the first secured message. ### Claim 18 (depends on 16) The method of claim 16, further comprising: decrypting, by the second system, the first secured message using the first key. ### Claim 19 (depends on 16) The method of claim 16, further comprising receiving, by the first system, the first key from an emanator, the emanator configured to transmit the first key once. ### Claim 20 A system, comprising: a signal generator; an integrated circuit communicatively coupled to the signal generator, the integrated circuit configured to process a signal output from the signal generator; and a mixer circuit communicatively coupled to the integrated circuit configured to receive a key and create a secured message by applying the key to the signal, wherein a complexity of the signal is lower than a complexity of the secured message.