Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Toshio Tokita

Toru Sorimachi

A code generation apparatus () generates a plurality of spreading code sequences, using block encryption processing of outputting a plurality of blocks as a spreading code sequence (D). A parameter selection unit () acquires a sequence parameter (KP) uniquely corresponding to each spreading code sequence (D) of the of the plurality of spreading code sequences. A secret key acquisition unit () acquires a secret key (K). A code sequence generation unit () changes output data that is output from each of process elements, using the sequence parameter (KP), when the code sequence generation unit () generates each spreading code sequence (D) of the plurality of spreading code sequences by the block encryption processing using the sequence parameter (KP) and the secret key (K).

Code generation apparatus, code generation method, and computer readable medium

To encrypt another piece of data during encrypting process of a certain piece of data, a memoryis provided in parallel with a feedback linewhich feeds back data from an encrypting moduleusing an encryption key K to a selectorWhen an interrupt IT for processing plaintext block data Nis generated while plaintext block data Mis processed, ciphertext block data Cat timing of generation of the interrupt IT is made to be stored in a registerThe ciphertext block data Cstored in the memoryis made to be selected by the selectorat timing of completion of processing the plaintext block data N, and processing the plaintext block data Mis started.

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Tokyo, Japan

Toru Sorimachi