APPARATUS FOR SYMMETRIC-KEY ENCRYPTION AND APPARATUS FOR SYMMETRIC-KEY DECRYPTION

Title:

APPARATUS FOR SYMMETRIC-KEY ENCRYPTION AND APPARATUS FOR SYMMETRIC-KEY DECRYPTION

Document Type and Number:

Japanese Patent JP3864798

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To provide a symmetric-key cryptographic processing technique capable of realizing both high-speed cryptographic processing having a high degree of parallelism, and alteration detection.
SOLUTION: A redundancy is added to the data desired to encrypt, the resulting data are encrypted by using a key stream whose length is truly longer than the resulting data to produce a cipher text. In the corresponding decryption, confirming the decryption of the redundancy can detect alteration during communication. The success probability of the alteration detection can be evaluated, and the processing with high parallelism and a smaller mount scale is faster than that of a block cipher.

Inventors:

Soichi Furuya
Kazuo Takaragi
Hiroyuki Kurumaya
Masashi Takahashi
Kunihiko Miyazaki
Naonori Sato
Dai Watanabe

Application Number:

JP2002034787A

Publication Date:

January 10, 2007

Filing Date:

July 06, 2000

Export Citation:

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Assignee:

株式会社日立製作所

International Classes:

G09C1/00; H04L9/20; (IPC1-7): H04L9/20; G09C1/00

Domestic Patent References:

JP11161162A
JP7028405A

Other References:

TRANSPARENT AUTHENTICATION AND CONFIDENTIALITY FOR STREAM SOCKETS,IEEE Micro,1996年 6月,Vol.16, No.3,p.34-41
メッセージ認証可能なストリーム暗号操作モード,暗号と情報セキュリティシンポジウムSCIS2000講演論文集,2000年 1月27日,p.SCIS2000-A17
第2章ブロック暗号と逐次暗号,暗号:コンピュータ・データ保護の新展開,株式会社自然社,1986年 2月10日,p.13-116
Integrity-Aware PCBC Encryption Scemes,Lecture Notes in Computer Science,2000年 5月17日,Vol.1796,p.153-171

Attorney, Agent or Firm:

Manabu Inoue

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