ENCRYPTION DEVICE OF CLOCK CONTROL TYPE STREAM CIPHER, DECRYPTION DEVICE OF CLOCK CONTROL TYPE STREAM CIPHER, ENCRYPTION METHOD OF CLOCK CONTROL TYPE STREAM CIPHER, DECRYPTION METHOD OF CLOCK CONTROL TYPE STREAM CIPHER AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To reduce a frequency to refer to a table and improve effective performance in clock control type stream cipher.;SOLUTION: When a reference table number corresponding to a clock bit is denoted as q and all data inputted into the reference table as C, an input bit C' obtained by adding C after q is defined, and a new reference table T' for everything is generated from a relational expression shown in a number 3 which is composed of the new reference table T', the defined input bit C', a reference table Tq corresponding to the clock bit and the data C inputted into the reference table. Then the clock bit is outputted by means of bit input from a first shift register, and an input bit c' obtained by adding c after q is defined when the reference table number corresponding to the clock bit is denoted as q and data inputted to the reference table as c. The defined input bit c' is inputted into the preliminarily generated reference table T'.;COPYRIGHT: (C)2013,JPO&INPIT