STREAM ENCRYPTION PROCESSING SYSTEM, ANTI-TAMPER DEVICE, AND STREAM ENCRYPTION PROCESSING METHOD

摘要

PROBLEM TO BE SOLVED: To execute initialization processing for stream encryption in an anti-tamper device, to perform subsequent encryption/decryption processing by another device, and to make stream encryption algorithm hierarchical in the initialization processing.SOLUTION: An anti-tamper device includes hash function processing means of receiving a held secrete key and an initial value output from a terminal and outputting a corresponding hash value as an initial key, and initialization processing means of performing initialization processing of stream encryption on the basis of the initial key and the initial value output from the terminal, and outputting an initial status after the initialization processing to the terminal. The terminal includes stream encryption processing means of receiving the internal status input from the anti-tamper device and performing encryption or decryption processing of stream encryption.