Telegraphy – Systems – Printing
Patent
1976-04-26
1978-02-14
Engle, Samuel W.
Telegraphy
Systems
Printing
H04L 902
Patent
active
040740668
ABSTRACT:
A message transmission system for the secure transmission of multi-block data messages from a sending station to a receiving station.
The sending station contains cryptographic apparatus operative in successive cycles of operation during each of which an input block of clear data bits is ciphered under control of an input set of cipher key bits to generate an output block of ciphered data bits for transmission to the receiving station. Included in the cryptographic apparatus of the sending station is means providing one of the inputs for each succeeding ciphering cycle of operation as a function of each preceding ciphering cycle of operation. As a result, each succeeding output block of ciphered data bits is effectively chained to all preceding cycles of operation of the cryptographic apparatus of the sending station and is a function of the corresponding input block of clear data bits, all preceding input blocks of clear data bits and the initial input set of cipher key bits.
REFERENCES:
patent: 3657699 (1972-04-01), Rocher et al.
patent: 3725579 (1973-04-01), Sturzinger
patent: 3796830 (1974-03-01), Smith
patent: 3949208 (1976-04-01), Carter
patent: 3958081 (1976-03-01), Ehrsam et al.
Ehrsam William F.
Meyer Carl H. W.
Smith John L.
Tuchman Walter L.
Cangialosi S. A.
Engle Samuel W.
International Business Machines - Corporation
Lester Edwin
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