INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING METHOD, AND INFORMATION PROCESSING PROGRAM

摘要

[PROBLEMS] To provide an architecture information processing system having a small circuit size capable of reducing power consumption and cost, on which system a circuit simultaneously executing an encryption process and a message authentication (tamper detection process) can be mounted. [MEANS FOR SOLVING PROBLEMS] The information processing system includes: at least a one-way Hash operation unit (122) executing an one-way Hash operation as a technique for realizing message authentication and functioning instead of the conventional common key block encryption (DES encryption) operation as an encryption operation unit of a parameter storage unit (11) holding an initialization vector used as a chain start block and an encryption key used for encryption and a block encryption mode use unit (12) performing an encryption process and/or a decryption process as a CFB mode and/or an OFB mode; and a key overlay operation unit (121) overlay-operating the encryption key held in the parameter storage means (11) on data inputted into the encryption operation unit.