Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate
2007-04-03
2007-04-03
Louis-Jacques, Jacques (Department: 2134)
Cryptography
Communication system using cryptography
Symmetric key cryptography
C380S210000, C713S193000
Reexamination Certificate
active
09818567
ABSTRACT:
A symmetric-key cryptographic technique capable of realizing both high-speed cryptographic processing having a high degree of parallelism, and alteration detection. The invention includes dividing plaintext composed of redundancy data and a message to generate plaintext blocks each having a predetermined length, generating a random number sequence based on a secret key, generating a random number block corresponding to one of the plaintext blocks from the random number sequence, outputting a feedback value obtained as a result of operation on the one plaintext block and the random number block, the feedback value being fed back for using in the operation on another plaintext block, and performing an encryption operation using the one plaintext block, random number block, and feedback value.
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Furuya Soichi
Kurumatani Hiroyuki
Miyazaki Kunihiko
Sato Hisayoshi
Takahashi Masashi
Hitachi , Ltd.
Louis-Jacques Jacques
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Tran Ellen C
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