Communication data freshness confirmation system
First Claim
1. A communication data freshness confirmation system comprising:
- a transmitting device; and
a receiving device that transmits challenge information to the transmitting device;
whereinupon receiving the challenge information, if the transmitting device has only one item of communication data to transmit to the receiving device, the transmitting device responds to the challenge and transmits single converted data to the receiving device;
upon receiving the challenge information, if the transmitting device has a first item of communication data and at least one additional item of communication data to transmit to the receiving device, the transmitting device initializes a time varying parameter, uses the time varying parameter to convert the first item of communication data to first converted data and each item of additional communication data to additional converted data, and transmits the first converted data and the additional data to the receiving device, updating the time varying parameter at least after each conversion of the additional communication data; and
the receiving device uses at least the time varying parameter to confirm freshness of the additional converted data.
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Accused Products
Abstract
A receiving device sends challenge information to a transmitting device. The transmitting device initializes a time varying parameter and transmits communication data together with data derived from the challenge information to the receiving device. Subsequent communication data, if any, are then transmitted together with data derived from the time varying parameter. The receiving device uses the challenge information to verify the freshness of the communication data transmitted first, and uses the time varying parameter to verify the freshness of the subsequent communication data. Freshness can be verified without having to maintain any type of verification data during sleep periods, and without having to send a separate challenge for each data transmission.
30 Citations
19 Claims
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1. A communication data freshness confirmation system comprising:
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a transmitting device; and a receiving device that transmits challenge information to the transmitting device;
whereinupon receiving the challenge information, if the transmitting device has only one item of communication data to transmit to the receiving device, the transmitting device responds to the challenge and transmits single converted data to the receiving device; upon receiving the challenge information, if the transmitting device has a first item of communication data and at least one additional item of communication data to transmit to the receiving device, the transmitting device initializes a time varying parameter, uses the time varying parameter to convert the first item of communication data to first converted data and each item of additional communication data to additional converted data, and transmits the first converted data and the additional data to the receiving device, updating the time varying parameter at least after each conversion of the additional communication data; and the receiving device uses at least the time varying parameter to confirm freshness of the additional converted data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification