Method and device for enciphering data to be transferred and for

Details Method and device for enciphering data to be transferred and for Method and device for enciphering data to be transferred and for

1991-11-12

1993-07-27

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 29, 380 33, 380 37, 380 49, H04L 906

Patent

active

052316629

ABSTRACT:
Method and device for enciphering data words of a word width of n bits, in particular data words to be written in a computer storage, wherein a product cipher circuit comprises alternately one from a plurality of permutation boxes with n inputs and n outputs and one from a plurality of substitution boxes with n inputs and n outputs, each of these boxes being under the control of a specific part of an m-bits key. In the product cipher circuit the data words are consecutively enciphered in whole and the enciphering device can be regarded as a delay line. The data words to be enciphered can be combined with coding words which depend on the specific sector of the computer storage, in particular a hard storage disk unit, where the data words are stored. The sector-specific coding words and/or the m-bits key can be combined with a key to be entered by a user.

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