Secure teleconferencing system

Details Secure teleconferencing system Secure teleconferencing system

1987-12-21

1989-07-04

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 47, 380 9, H04L 904

Patent

active

048457493

ABSTRACT:
A secure audio teleconferencing system is disclosed. The secure teleconferencing system comprises a centralized facility or bridge to which a plurality of participants is connected. The role of the bridge is to receive encrypted message signals from the participants and to add the encrypted message signals, modulo some known number. The result is then transmitted to the participants. Each participant is able to decrypt the modular sum of encrypted message signals, to obtain the desired ordinary sum of clear text message signals. In accordance with the invention, the message signals remain encrypted throughtout processing by the bridge. There are no non-encrypted messages.

REFERENCES:
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patent: 3204034 (1965-08-01), Ballard et al.
patent: 4264781 (1981-04-01), Oosterbaan et al.
patent: 4308617 (1981-12-01), German, Jr.
patent: 4411017 (1983-10-01), Talbot
patent: 4555805 (1985-11-01), Talbot
patent: 4750205 (1988-07-01), Lee et al.

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