Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1986-12-11
1988-12-27
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 21, 380 25, 380 44, 380 46, H04K 102
Patent
active
047946440
ABSTRACT:
The Telecommunications system includes at least two exchanges and a plurality of user equipments. Each equipment includes a store for holding a user variable data word particular to that user. Each exchange is provided with a store for holding all the user variable data words of the users connected to it, and each exchange is also provided with its own random variable data word. When a first user makes a secure call to a second user, the first user equipment encrypts the call using its particular variable data word and sends the encrypted data to its own exchange. The exchange decrypts the call using the particular user variable data word that will be used for the call. The exchange encrypts the random variable data word with the particular user variable data word and returns it to the first user. The exchange also sends the random variable data word to the second user's exchange which encrypts it with the user variable data word particular to the second user, and sends it to the second user.
REFERENCES:
patent: 4369443 (1983-01-01), Giallanza et al.
patent: 4458109 (1984-07-01), Mueller-Schloer
patent: 4500750 (1985-02-01), Elander et al.
patent: 4549308 (1985-10-01), Lo Pinto
patent: 4578530 (1986-03-01), Zeidler
patent: 4578531 (1986-03-01), Everhard et al.
Chopping Geoffrey
Ozdamar Mahir
Philip Alexander S.
Cangialosi Salvatore
Oglo Michael F.
Renfro Julian C.
The Plessey Company, plc
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