ENCRYPTION PROCESSOR AND METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To improve transfer efficiency as a whole in communication adopting a block encryption algorithm, and also, to reduce loads to a device by reducing a processing amount during re-transmission control. SOLUTION: A key management part 43 predicts sequence numbers. A key generation part 44 generates encryption keys for communication respectively corresponding to the predicted sequence numbers. A key storage part 46 stores the encryption key for communication generated at the key generation part 44. A key reference 45 refers to the sequence number of the inputted encryption data (or data to be encrypted). The encryption key for communication corresponding to the sequence number is outputted from the key storage part 46 by the key reference 45. An exclusive OR operation part 47 executes decoding of the encryption data (or the encryption of the data to be encrypted) by executing the exclusive OR operation of the encryption key for communication outputted from the key storage part 46 and the encryption data (or the data to be encrypted). COPYRIGHT: (C)2004,JPO&NCIPI