| 摘要 |
PROBLEM TO BE SOLVED: To provide configuration for achieving efficient and certain communication in crypto-communication to which a system based on a CCM mode is applied. SOLUTION: In communication among a plurality of entities, a system based on so called, a CCM mode for transmitting/receiving a crypto-sentence in a counter mode and a message authenticator in CBC-MAC is applied, and a counter value is successively updated, and data transmission/reception is executed, and the counter value is reported and compared with a counter value held by itself, and synchronization confirmation is executed. Thus, it is possible to achieve errorless processing. For example, even when a command or reply data are lost due to the generation of any communication error or the like, or reply attack from the outside or data alternation is generated, it is not necessary to return to the original status, and to resume communication from the beginning, and it is possible to attain data processing resumption by reissuing a command from the point of time of error generation. COPYRIGHT: (C)2007,JPO&INPIT
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