Document copy authentication
First Claim
1. A process for making an authenticatable copy of an original document supplied by an entity, comprising:
- (a) making a hard copy of the original document and incorporating on the document a digital signature representing the document contents and the identity of the said entity.
4 Assignments
0 Petitions
Accused Products
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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Citations
18 Claims
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1. A process for making an authenticatable copy of an original document supplied by an entity, comprising:
(a) making a hard copy of the original document and incorporating on the document a digital signature representing the document contents and the identity of the said entity. - View Dependent Claims (2, 3)
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4. A process for validating the authenticity of a signed copy of an original document supplied by an entity, said signed copy having been provided with a digital signature using a secret signing key supplied by the entity comprising:
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(a) checking the digital signature of the signed copy using a public key mathematically related to the secret key, (b) indicating whether the signed copy is valid or invalid. - View Dependent Claims (5, 6, 7, 8)
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9. A system for authenticating hard copies of original documents comprising:
(a) a copying machine, said copying machine including, (i) means for receiving from an entity an original document, (ii) means for generating a digital signature from a document, (iii) means for receiving information uniquely identifying the entity supplying the original document, (iv) means for incorporating in the digital signature information representative of the entity'"'"'s identification, (v) means for producing a signed document first copy incorporating the digital signature. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
Specification