Efficient method for encrypting superblocks of data

Details Efficient method for encrypting superblocks of data Efficient method for encrypting superblocks of data

1989-06-30

1991-04-16

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 9, 380 28, 380 49, 380 50, H04L 906

Patent

active

050089358

ABSTRACT:
This invention relates to an arrangement for encrypting data for storage in a computer and/or for transmission to another data processing system. The plain text data is divided into buffers and the buffers are divided into blocks. The blocks are encrypted under the control of a first key using any block encryption method such as the Data Encryption Standard (DES). Individual bytes of the encrypted blocks of a buffer are then permuted under the control of a second key to form an encrypted buffer. Advantageously, the number of permutations for even a modest size buffer, say 256 bytes, is enormous, making unauthorized decryption using key searching methods computationally infeasible.

REFERENCES:
patent: 3921151 (1975-11-01), Guanella
patent: 4802220 (1989-01-01), Marker, Jr.
patent: 4907275 (1990-03-01), Hashimoto
D. Kahn, The Codebreakers, The Story of Secret Writing, 1967, pp. 339-347.

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