Method and device for enciphering data to be transferred and for deciphering the enciphered data, and a computer system comprising such a device
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United States of America Patent
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Jul 27, 1993
Issued Date -
N/A
app pub date -
Nov 12, 1991
filing date -
Aug 1, 1989
priority date (Note) -
Expired
status (Latency Note)
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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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