CRYPTOGRAPHIC DEVICE

PROBLEM TO BE SOLVED: To obtain a tamper-proof cryptographic device in which the cryptographic time is shortened by a relatively simple configuration.SOLUTION: A CPU 31 and a cryptographic calculator 32 are single packaged in a cryptographic module. During a cryptographic processing period T10 when cryptographic processing for partial encryption target data PD1-PD5 is performed by the cryptographic calculator 32, the CPU 31 performs read-ahead processing for reading the partial encryption target data PD2-PD6 from a memory, and power consumption processing other than the read-ahead processing (read processing (preliminary processing) performed during an access ID reading period T31 and dummy processing performed during dummy processing periods DT31-DT33).