Telegraphy – Systems – Printing
Patent
1977-11-17
1979-07-03
Buczinski, S. C.
Telegraphy
Systems
Printing
3401461AL, H04L 900
Patent
active
041601203
ABSTRACT:
An apparatus for insertion in a communications line for providing both message integrity and message secrecy within a significant portion of existing communications networks. At the transmitter end, the apparatus receives messages from the communications line, enciphers them on a bit-by-bit basis and retransmits them onto the communications line. At the receiver end, the apparatus receives messages from the communications line, deciphers them on a bit-by-bit basis and retransmits them onto the communications line. The apparatus contains both a transmitter and receiver and is capable of full duplex operation in a bidirectional communications line. According to the invention, data is enciphered by combining the data received with the output of an algorithm, the algorithm output being responsive to data previously received and a unique key entered by the user. As a data bit is received, it is combined with the output of the algorithm, transmitted, and using cipher feedback techniques fed back as an input to the algorithm to be used to encipher subsequently received data bits. Data is deciphered using equivalent elements as used for enciphering, the basic difference in the apparatus operation being the point from which data fed back into the algorithm is taken.
REFERENCES:
patent: 3876832 (1975-04-01), Morgan et al.
patent: 3911216 (1975-10-01), Bartek et al.
patent: 3984668 (1976-10-01), Zetterberg et al.
C. M. Campbell, Jr.; "Design and Specification of Cryptographic Capabilities"; preprint papers of NBS Conference on Computer Security and the Data Encryption Standard; 15 Feb. 1977.
B. Morgan; "Considerations in Applying an Encryption Device to a Communications Network"; Preprint Papers of NBS Conference on Computer Security and the Data Encryption Standard; 15 Feb. 1977.
Barnes Vera L.
Campbell, Jr. Carl M.
Dodds, Jr. Thomas J.
Gibson Harold F.
Buczinski S. C.
Burroughs Corporation
Chung Edmund M.
Peterson Kevin R.
Starr Mark T.
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