Cryptography – Electric signal modification – Having production of printed copy
Patent
1995-12-28
1999-07-20
Cangialosi, Salvatore
Cryptography
Electric signal modification
Having production of printed copy
H04L 900
Patent
active
059265515
ABSTRACT:
A system and method are provided for facilitating proof that a specific item, such as a document, has been sent via a communication medium, such as the mail service of the United States Postal Service, at a specific time. A bit map image is produced, such as by scanning a hard copy document. Preferably the bit map is compressed into a data string and hashed. The hash file is signed by a certifying authority, such as the USPS, using an existentially unforgeable signature scheme. The original document, a code representation of the string, and a code representation of the signature are sent via the communication medium. As a result, the combination of materials sent provides proof of the authenticity of the content of the document.
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Dwork Cynthia
Naor Moni
Pestoni Florian
Cangialosi Salvatore
International Business Machines - Corporation
Pintner James C.
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