发明名称 |
HASH VALUE GENERATING METHOD, DATA CIPHERING METHOD, DATA DECIPHERING METHOD, HASH VALUE GENERATING DEVICE DATA CIPHERING DEVICE, AND DATA DECIPHERING DEVICE |
摘要 |
PROBLEM TO BE SOLVED: To disorder data efficiently by performing a multiplying process which makes the length of an output value longer than that of an input value in a hash value generating process. SOLUTION: Expanded data 107 generated by a data expansion part 102 are divided into 64-bit frames (group of blocks) like a 1st section E1 108, a 2nd section E2 109... and inputted to a single-shot expansion part 105 in order. The single-shot expansion part 105 performs a single-shot expanding process for the 1st section E1 108 by using a 256-bit initial value 110 as a parameter while performing conversion and transposition. For the 2nd section E2 109, a single-shot expanding process is performed by using a 1st 256-bit intermediate output which is obtained while conversion and transposition are carried out. Consequently, a 2nd 256-bit intermediate output is calculated. This process is repeated until the frame of the final section is inputted and then the 256-bit intermediate output which is calculated finally is used as a hash value Hash 111.
|
申请公布号 |
JPH10340048(A) |
申请公布日期 |
1998.12.22 |
申请号 |
JP19970149423 |
申请日期 |
1997.06.06 |
申请人 |
HITACHI LTD |
发明人 |
TAKARAGI KAZUO;KURUMAYA HIROYUKI |
分类号 |
H04L9/06;G09C1/00;H04L9/30;H04L9/32;(IPC1-7):G09C1/00 |
主分类号 |
H04L9/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|