Encryption apparatus, decryption apparatus, expanded key...

Details Encryption apparatus, decryption apparatus, expanded key... Encryption apparatus, decryption apparatus, expanded key...

2007-03-20

2007-03-20

Sheikh, Ayaz (Department: 2131)

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

C380S029000, C380S042000, C380S044000, C380S045000

Reexamination Certificate

active

09902696

ABSTRACT:
Expanded key schedule circuit for common key encryption system in which expanded keys are used in a predetermined order in data randomizing process for encryption and in a reversed order in data randomizing process for decryption, comprises round processing circuits connected in series. The round processing circuits subject the common key or sub key of a previous stage to a round function to output a sub key. The sub key of the last stage is equal to the common key. The expanded keys are generated from the sub keys.

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