Method and system for cryptographically authenticating a printed document by a trusted party
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United States of America Patent
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Jun 14, 2005
Grant Date -
N/A
app pub date -
Feb 15, 2000
filing date -
Mar 26, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for authenticating a printed document is described. A document producer sends information to be included in a document to an authentication authority. The authentication authority cryptographically generates an authentication code from this information, and sends the authentication code back to the document producer. The document producer then prints the document, including both the information and the authentication code, and a bar code representing the authentication code. A document checker scans in the bar code, and cryptographically checks the authentication code against the information in the document.
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