Data communication system and method with data scrambling

Cryptography – Particular algorithmic function encoding – Nbs/des algorithm

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380 28, 380 44, H04L 906

Patent

active

054886619

ABSTRACT:
Data communication system and method with a data scrambling with high security. A data scrambling part is provided with a extended key memory for storing addresses of extended keys, and one of the extended keys is used as a parameter for scrambling an input data to be scrambled. In order to select one of the extended keys to be input to each processing block for converting the input data by using the parameter to output converted data, a selector varies the address of the extended key depending on a plaintext of the input data.

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