Side Channel Communications
First Claim
1. A method comprising:
- generating an external signal representing an external information to be conveyed to a receiver device, operational speed of internal circuitry of the receiver device being dependent upon the external signal;
receiving the external signal at the receiving device;
measuring a value of the operational speed of the internal circuitry; and
decoding the measured value of the operational speed to generate a value of the external information.
2 Assignments
0 Petitions
Accused Products
Abstract
A side channel communications system disclosed herein includes a receiver device with an internal circuitry where the operational speed of the internal circuitry changes in response to an external signal. When the receiver device receives an external signal, the operational speed of the internal circuitry changes. A detector detects the change in the operational speed of the internal circuitry to generate an output value, which is decoded to determine the information communicated by the external signal. In one implementation of the side channel communications system, the external transmitter communicates the external signal in the form of a temperature signal. Alternatively, the external transmitter communicates the external signal in the form of a change in the supply voltage.
25 Citations
20 Claims
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1. A method comprising:
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generating an external signal representing an external information to be conveyed to a receiver device, operational speed of internal circuitry of the receiver device being dependent upon the external signal; receiving the external signal at the receiving device; measuring a value of the operational speed of the internal circuitry; and decoding the measured value of the operational speed to generate a value of the external information. - View Dependent Claims (2, 3, 4)
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5. A method comprising:
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receiving an external signal at a receiving device, the external signal representing external information; measuring a value of operational speed of internal circuitry of the receiving device, the operational speed of the internal circuitry being dependent upon an external signal received at the receiving device; and decoding the measured value of the operational speed of the internal circuitry to generate a value of the external information. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A device comprising:
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circuitry configured to receive an external signal at a receiving device, the external signal representing external information; a detector configured to measure a value of operational speed of internal circuitry of the receiving device, the operational speed of the internal circuitry being dependent upon an external signal received at the receiving device; and a decoder coupled to the detector to receive the output value from the detector and configured to decode the measured value of the operational speed of the internal circuitry to generate a value of the external information. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification