Apparatus for electronic encypherment of digital data

Details Apparatus for electronic encypherment of digital data Apparatus for electronic encypherment of digital data

1977-11-29

1979-08-21

Buczinski, S. C.

Telegraphy

Systems

Printing

3401461AL, H04L 900

Patent

active

041654447

ABSTRACT:
Apparatus and methods are described for finding the coefficients of minimum polynominals in a Galois field GF(2.sup.m). Such coefficients are useful in selecting tap connections for a shift register, the taps usually being connected to an EX-OR gate in a feedback connection to the input shift register stage. Where 2.sup.m -1 is prime, with the selected tap connections the shift register generates a maximal length sequence which can be used for encyphering or decyphering. Several forms of apparatus for such processes are also described.

REFERENCES:
patent: 3629824 (1971-12-01), Bossen
patent: 3740475 (1973-06-01), Ehrat
patent: 3958081 (1976-05-01), Ehrsam et al.
patent: 3962539 (1976-06-01), Ehrsam et al.
patent: 3988538 (1976-10-01), Patten
D. J. Sykes, Datamation, Aug. 1976, pp. 81-85, 178-22.
H. Feistel, "Scientific American", May 1973, vol. 228, No. 5, pp. 15-23, 178-22.
Proposed Federal Information Processing Data Encryption Standard, Federal Register of 1 Aug. 1975, 178-22.
D. J. Torrieri, Word Error Rates in Cryptographic Ensembles, Naval Research Lab Report 7616.

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