Cipher system with closed cipher procedure

Details Cipher system with closed cipher procedure Cipher system with closed cipher procedure

1988-05-04

1991-01-08

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 4, 380 28, H04L 900

Patent

active

049842714

ABSTRACT:
A cipher system in a computer network having a host computer and terminal equipments connected by communication lines. A terminal equipment cipher process program memory area is provided in a volatile memory area of a storage of a terminal equipment which upon turning-on of its power, requests a transfer of the terminal cipher process program from the host computer to the terminal equipment. In response to the request, the host computer sends the terminal cipher process program previously developed at the host computer side to the terminal equipment to thereby make the program to be stored in the memory area of the terminal equipment. Enciphering and deciphering during communication between the host computer and the terminal equipment are performed by using the host computer and terminal equipment cipher process programs stored in the respective host computer and the terminal equipment.

REFERENCES:
patent: 4465901 (1984-08-01), Best
patent: 4484025 (1984-11-01), Ostermann et al.
patent: 4486828 (1984-12-01), Kitamura et al.
patent: 4691355 (1987-09-01), Wirstrom et al.
patent: 4694492 (1987-09-01), Wirstrom et al.
patent: 4727368 (1988-02-01), Larson et al.
patent: 4797928 (1989-01-01), Pykes
patent: 4811288 (1989-03-01), Kleijne et al.
Security Measures for Protecting Information Against Tapping and Falsification, by Danial Fidlow.
Nikkei Communications, Jun. 22, 1985, pp. 58-66.

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