Communication method and apparatus for carrying out cipher commu

Details Communication method and apparatus for carrying out cipher commu Communication method and apparatus for carrying out cipher commu

1996-06-05

1998-12-08

Dougherty, Elizabeth L.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 18, 380 9, H04L 900, H04K 102

Patent

active

058481567

ABSTRACT:
A communication method that can easily carry out cipher communication. At the caller, a secret key is produced based on data including the caller's own telephone number and the telephone number of the called station, and then image data is transmitted after enciphering it based on that secret key. At the called station, modem signal data including the telephone number of the caller transmitted during the ring off period of the call tone is received, the telephone number of the caller is detected from among that received data and a secret key is produced based on the telephone numbers of the caller and the called station. Afterwards when coded data is received, the coded data is deciphered based on that secret key and printed out.

REFERENCES:
patent: 4182933 (1980-01-01), Rosenblum
patent: 5241595 (1993-08-01), Kuno
patent: 5253293 (1993-10-01), Shigemitsu et al.
patent: 5289542 (1994-02-01), Kessler
patent: 5574785 (1996-11-01), Ueno et al.
patent: 5671285 (1997-09-01), Newman

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