HASH FUNCTION DEVICE, HASH VALUE OPERATION METHOD, HASH VALUE OPERATION PROGRAM, ELECTRONIC SIGNATURE DEVICE, ELECTRONIC SIGNATURE METHOD AND ELECTRONIC SIGNATURE OPERATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To attain a hash function device which is constituted only of a compression function which is relatively simply constituted and has high affinity with a signature function.;SOLUTION: In order to collateralize safety of a TCR hash function, a fixed length random number key is added to an optional length random number key originally provided to the TCR hash function and processing for modifying message digest of the TCR hash function is added. By this processing, provision of input of fixed length to the signature function is attained by the TCR hash function constituted of an SPR compression function.;COPYRIGHT: (C)2009,JPO&INPIT