Apparatus and method for enciphered facsimile transmission and r

Cryptography – Key management – Having particular key generator

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380 42, 380 43, 380 50, H09N 144, H04L 900

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active

052336530

ABSTRACT:
An enciphered facsimile apparatus in which encoded image data is fetched one block at a time, and chained encipherment is executed in a reverse direction, respectively. Upon completion of encipherment, the enciphered image data is read in the reverse direction, and is demodulated to transmit to a network. Meanwhile, on the reception side, the enciphered image data received is fetched one block at a time, and deciphering is effected in the reverse direction. Upon completion of deciphering, decoding is effected in the reverse direction so as to confirm whether or not deciphering has been effected correctly. Thereby, the image data enciphered cannot be readily deciphered by a third party.

REFERENCES:
patent: 4392021 (1983-07-01), Slate
patent: 4912761 (1990-03-01), Tan et al.
"Cryptography: A New Dimension in Computer Data Security," by Carl H. Meyer et al., Shizen-sha, Inc. 1986, pp. 71-75.

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