Telegraphy – Systems – Printing
Patent
1984-03-14
1986-06-24
Cangialosi, Salvatore
Telegraphy
Systems
Printing
178 2208, 178 2214, 178 2219, H04K 102
Patent
active
045968985
ABSTRACT:
Protection of transmitted and stored data from compromise or interception is achieved by a combined terminal authentication and encryption technique using a random number as part of both the encryption and authentication processes. Entry of data for transmission at a transmitting terminal automatically establishes a random number which is tranmitted ahead of the data stream along with a special fixed word and a code word which is encoded with the random number. The receiving station stores the random number and decodes the code word. The decoded code word and the received special word are compared to respective pre-stored counterparts thereof to determine authenticity of the transmitting terminal. Data encryption is effected by using three keys which depend, respectively, on data word content, data word sequence and the established random number.
REFERENCES:
patent: 3657521 (1972-04-01), Constable
patent: 4186871 (1980-02-01), Anderson et al.
patent: 4208575 (1980-06-01), Haltof
patent: 4328414 (1982-04-01), Atalla
patent: 4431865 (1984-02-01), Bernede et al.
patent: 4447672 (1984-04-01), Nakamura
patent: 4464678 (1984-08-01), Schiff et al.
patent: 4465153 (1984-08-01), van de Pas et al.
Cangialosi Salvatore
Computer Security Systems, Inc.
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