Telegraphy – Systems – Printing
Patent
1978-10-02
1981-06-23
Birmiel, Howard A.
Telegraphy
Systems
Printing
340348, H04L 900
Patent
active
042752655
ABSTRACT:
A complete substitution permutation enciphering and deciphering circuit and method for transforming a plaintext signal into an enciphered signal which is secure during transmission. After receipt, the enciphered signal is transformed back into the original plaintext signal by use of a similar circuit and method. A complete substitution permutation enciphering and deciphering circuit is constructed by interconnecting a number of substitution boxes. Each substitution box is complete, that is each binary bit of the substitution box output is dependent on all binary bits of the substitution box input for all possible combinations of input signals. When such substitution boxes are connected according to the invention, the substitution permutation enciphering and deciphering circuit formed thereby is complete in the sense that every output signal of the circuit is dependent on all input signals of the circuit.
REFERENCES:
patent: 2403280 (1946-07-01), Hicks
patent: 2424998 (1947-08-01), Nyquist
patent: 2547515 (1951-04-01), Zenner
patent: 2629012 (1953-02-01), Ehrat
patent: 2802047 (1957-08-01), Hagelin
patent: 2984700 (1961-05-01), Small
patent: 3988538 (1976-10-01), Patten
patent: 4074066 (1978-02-01), Ehrsam et al.
Davida George I.
Kam John B.
Birmiel Howard A.
Bremer Howard W.
Cook Robert W.
Wisconsin Alumni Research Foundation
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