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There are two versions of the REDOC algorithm, REDOC II, and REDOC III.

REDOC II is considered to be secure; an attack has been made against one round of REDOC II, but could not be extended to all 10 recommended rounds. REDOC II is interesting in that it uses data masks to select the values in the S-boxes. REDOC II uses a 160-bit key and works on an 80-bit block. REDOC III was an attempt to make the painfully slow REDOC II faster. REDOC III, like REDOC III, operates on an 80-bit block, but can accept keys up to 20480 bits. However, REDOC III falls to differential cryptanalysis[1].

REDOC is patented.

See Also


  1. Differential Cryptanalysis of REDOC III

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