Automatic resynchronization of crypto-sync information

Details Automatic resynchronization of crypto-sync information Automatic resynchronization of crypto-sync information

H - Electricity

04

L

H04L 9/12 (2006.01)

Patent

CA 2322404

An apparatus and method for transmitting and receiving cryptographic information which provide a mechanism for resynchronization between a transmitter and receiver of the cryptographic information. A cryptographic synchronization counter at the transmitter generates a transmitter signature tag. A corresponding cryptographic synchronization counter at the receiver generates a receiver signature tag. Information is ciphered and the transmitter signature tag is appended to the ciphered information. The ciphered information is received. The transmitter signature tag is compared to the receiver signature tag and the cipher text is decipher into plain text if the tags are equal. If the tags are not equal, the receiver crypto-sync counter is incremented and a new receiver signature tag is calculated to determine if the receiver is resynchronized (i.e., tags are equal) to the transmitter. If after a certain number of increments, resynchronization does not occur, a resynchronization procedure is initiated.

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