Telegraphy – Systems – Printing
Patent
1984-04-13
1986-08-19
Cangialosi, Salvatore
Telegraphy
Systems
Printing
179 15R, 178 2219, H04L 900
Patent
active
046071377
ABSTRACT:
In a communication network with cryptographically protected connections a unique key is used for each connection between two subscribers, so that when one or more keys fall into the hands of an unauthorized person it has no consequences for the protection of the remaining connections. In a network comprising N subscribers this implies that each participant must have N-1 keys for communication with the other participants. Such a set of N-1 keys is obtained by putting a column from a N.times.N key matrix (main diagonal empty) at the disposal of each participant. During the connection set-up the correct unique key is automatically selected by interchange of the column number. The key matrices used in the network can be regularly replaced without it being necessary to interrupt the operation of the network.
REFERENCES:
patent: 4140873 (1979-02-01), Kinch, Jr. et al.
patent: 4177355 (1979-12-01), Fleisher et al.
patent: 4182933 (1980-01-01), Rosenblum
patent: 4343967 (1982-08-01), McArdle
patent: 4370519 (1983-01-01), McArdle
patent: 4520232 (1985-05-01), Wilson
Hafkamp Frederik
Jansen Cornelis J. A.
van de Pas Andries J. M.
van der Vlist Pieter
Cangialosi Salvatore
Eason Leroy
Lewis Aaron J.
Streeter William J.
U.S. Philips Corporation
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