| 摘要 |
PROBLEM TO BE SOLVED: To achieve a method for making encryption resistant to differential power analysis by including, when performing encryption processing by reference to a table, a transformation processing which does not require reconstruction of the table by an encryption key and which is known only to the designer. SOLUTION: In initial key additions 101-103 or key additions 110-112 and the like, by inputting an extended key generated from an encryption key in a key schedule section and input data and by using a table reflecting the computation result made to correspond to the extended key and input data, the addition processing of the extended key and the input data, an injective transformation processing of the data after the addition processing and the like can be performed by single reference to the table. Thus, the encryption can be made resistant to differential power analysis by including a transformation processing which does not require reconstruction of the table for each encryption key and which is known only to the designer. COPYRIGHT: (C)2009,JPO&INPIT |
