METHOD AND DEVICE FOR DECODING PROCESSING OF ENCRYPTED DATA

PROBLEM TO BE SOLVED: To attain high speed decoding of encrypted data in an operation mode by a CBC system or a CFB system or the like in a DES encryption mechanism or the like. SOLUTION: A DES computing unit 310 (320) is provided with a next arithmetic operation use changing value generating sectio...

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Bibliographic Details
Main Authors KOKUNI SATORU, HIRAYAMA NAOKI, SAKO KAZUHIKO, TAMURA TAKATSUGU
Format Patent
LanguageEnglish
Published 20.10.2000
Edition7
Subjects
ADVERTISING
CODING OR CIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHERPURPOSES INVOLVING THE NEED FOR SECRECY
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PHYSICS
SEALS
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PROBLEM TO BE SOLVED: To attain high speed decoding of encrypted data in an operation mode by a CBC system or a CFB system or the like in a DES encryption mechanism or the like. SOLUTION: A DES computing unit 310 (320) is provided with a next arithmetic operation use changing value generating section 314 (324). In the DES computing unit 310, in parallel with decoding processing of encrypted text data 301 by an encryption core section 315, the next arithmetic operation use chaining value generating section 314 generates a next arithmetic operation use chaining value 330 and gives the result to the DES computing unit 320. An encryption core section 323 executes decoding processing of next encryption text data 303 by using the chaining value in overlapping with the decoding processing by the DES computing unit 310 and the next arithmetic operation use the chaining value generating section 324 generate a next arithmetic operation use chaining value 331 similarly in parallel with the execution and gives it to be DES computing unit 310.
Bibliography:Application Number: JP19990094744