Document copy authentication

Details Document copy authentication Document copy authentication

1991-12-19

1992-10-20

Swann, Tod R.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 55, H04K 100

Patent

active

051577267

ABSTRACT:
A system for authenticating a hard copy of an original document. The system employs a special copying machine at the sender's end together with a special ID card (smart card) or other user identification for activating the special machine, and a special copying machine at the receiving end. At the sender's station, the original document and ID card are inserted into the machine. The latter digitizes the document text, to produce a digital signature which incorporates unique information from the sender's ID card. This machine then produces a hard copy of the document to which is added the digital signature. The sender retains the original, but forwards the copy to the recipient or receiver. The receiver then inserts the received copy into the machine at his location, which digitizes and processes the document text and signature and indicates whether the digital signature is valid. Preferably a dual key authentication system is used, with the digital signature incorporating the sender's secret signing key, and the receiver using the related public key in the validation process.

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patent: 4981370 (1991-01-01), Dziewit et al.
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patent: 5001752 (1991-03-01), Fischer
patent: 5020105 (1991-05-01), Rosen et al.
patent: 5022080 (1991-06-01), Durst et al.

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