Algorithm variable encryption device, algorithm variable decryption device, algorithm variable encryption method, algorithm variable decryption method, and program

摘要

PROBLEM TO BE SOLVED: To provide an algorithm variable type encryption device, an algorithm variable type decryption device, the method and a program, for varying an algorithm by a key while guaranteeing constant safety and processing performance.;SOLUTION: The algorithm variable type encryption device comprises a round function for executing prescribed processing for two or more times, and the round function comprises a part where the algorithm varies and a part where it is fixed at all times corresponding to input key bit information.;COPYRIGHT: (C)2012,JPO&INPIT