Method and apparatus for code transmission

Details Method and apparatus for code transmission Method and apparatus for code transmission

1982-06-02

1986-03-25

Cangialosi, Salvatore

Telegraphy

Systems

Printing

178 2214, 178 2217, H04L 904

Patent

active

045785325

ABSTRACT:
A transmission code required for decoding an encoded transmission of messages between a transmitting station and a receiving station is first transmitted from one station to the other. Previously identified passwords are used to encode the transmission code, by the transmitting station, together with a transmission station code. At the receiving station, a code signal is decoded with the password and reencoded with a receiving station code and with an additional password. The transmitting station receives the encoded acknowledgement from the receiving station, decodes the acknowledgement using the second password, and its own station code, and reencodes it with a third password, transmitting the result back to the receiving station. The receiving station extracts the transmission code from the second transmission from the transmitting station, by decoding it with the receiving station's station code and the third password.

REFERENCES:
patent: 4193131 (1980-03-01), Lennon et al.
patent: 4203166 (1980-05-01), Ehrsam et al.
patent: 4211891 (1980-07-01), Glitz
patent: 4386234 (1983-05-01), Ehrsam et al.
patent: 4458109 (1984-07-01), Mueller-Schloer

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