ENCRYPTION GENERATOR, ENCRYPTION DECODER, ENCRYPTION GENERATING PROGRAM AND ENCRYPTION DECODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To disable decryption of other encrypted texts by using a pair of plain and encrypted texts. SOLUTION: An apparatus includes a parameter generating means 102 for generating parameter strings for use in chaos arithmetic on the basis of key data; a chaos noise generation means 103 for performing the chaos arithmetic by using the generated parameter strings and obtaining chaos noise; an exclusive OR circuit 105 for obtaining the encrypted texts by performing arithmetic to apply the chaos noise to plaintext information; and a feedback path for feeding back the encrypted texts obtained from the exclusive OR circuit 105 to the chaos noise generation means 103. The chaos noise generation means 103 obtains the chaos noise by performing the chaos arithmetic on the basis of the encrypted texts being fed back. COPYRIGHT: (C)2008,JPO&INPIT