Extended key preparing apparatus, extended key preparing...

Details Extended key preparing apparatus, extended key preparing... Extended key preparing apparatus, extended key preparing...

2005-10-18

2005-10-18

Smithers, Matthew (Department: 2137)

Cryptography

Key management

C380S046000

Reexamination Certificate

active

06956951

ABSTRACT:
Intermediate data ai, bi, ci, and diare prepared by an intermediate data preparing equipment4from a cryptographic key through a nonlinear type function operation and the like, an extended key preparing equipment5selects a [Xr], b [Yr], c [Zr], and d [Wr] corresponding to the number of stages r from the intermediate data, and rearranges the data as well as conducts that of bit operation to prepare extended keys, whereby an extended key preparing apparatus by which an extended key required in the case where common key cryptosystem is applied can be safely prepared at a high speed, a process for preparing such an extended key, and a recording medium used therefor are provided.

REFERENCES:
patent: 5511123 (1996-04-01), Adams
patent: 6570989 (2003-05-01), Ohmori et al.
patent: 1001398 (2000-05-01), None
Vanstone et al. “Handbook of Applied Cryptography”, Chapter 7, pp. 223-282, 1997.
Menezes et al., “Handbook of Applied Cryptography”, Chapter 7, pp. 223-282, 1997.
Ferguson et al., “Cryptanalysis of Akelarre”, Cryptanalysis of Akelarre23 Jul. 1997, pp. 1-12.
Carolynn Burwick et al. “MARS-a candidate cipher for AES”, IBM Corporation. Aug. 20-22, 1998. pp. 1-10.
Daemen et al., “AES Proposal: Rjindael”, The Rjindael Block Cipher, pp. 1-45, Sep. 3, 1999.

Affiliated with

Also associated with

Rating

Extended key preparing apparatus, extended key preparing... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Extended key preparing apparatus, extended key preparing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extended key preparing apparatus, extended key preparing... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3471208