Cryptography – Key management – Having particular key generator
Patent
1995-04-10
1996-04-16
Gregory, Bernarr E.
Cryptography
Key management
Having particular key generator
380 9, 380 10, 380 20, H04N 144, H04L 900
Patent
active
055090729
ABSTRACT:
A facsimile apparatus is provided with changeover means that makes it possible to pass signals through or to bypass a coder, which encrypts transmission information, and a decoder, which decodes encrypted information that has been received. Whether or not a facsimile apparatus belonging to another party has an encrypting/decoding processing function is verified by a pre-procedure signal. If the other party's apparatus possesses an encrypting/decoding processing function, control is performed in such a manner that encrypting/decoding processing is applied solely to an image signal and a training-check signal transmitted before transmission/reception of the image signal, and encrypting/decoding processing is not applied to a procedure signal which accompanies transmission reception of the image signal. If the other party's apparatus does not possess an encrypting/decoding processing function, it is possible to select between terminating communication and performing facsimile communication without executing encrypting/decoding processing.
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Diffie et al, "Privacy and Authentification: An Introduction to Cryptography"; Proc.s of the IEEE, (67,3;Mar., 1979).
Canon Kabushiki Kaisha
Gregory Bernarr E.
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