System for authenticating hardcopy documents
First Claim
1. A method for authenticating a hardcopy document, comprising the steps of:
- recording in a memory a scanned representation of the hardcopy document at a selected resolution;
generating lossy compressed image data with the scanned representation of the hardcopy document;
producing an authentication token with the lossy compressed image data;
the authentication token including one of encrypted image data and hashed encrypted image data;
the hashed encrypted image data including the lossy compressed image data and an encrypted hash of the lossy compressed image data; and
arranging in the memory the scanned representation of the hardcopy document with a digital encoding of the authentication token for rendering at a printer a signed and authenticated hardcopy document.
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Accused Products
Abstract
A system authenticates an original hardcopy document using a digital signature generation system and a digital signature verification system. Initially, the original hardcopy document is scanned to provide a bitmap image to the signature generation system. The bitmap image is highly compressed by the signature generation system using compression schemes such as MPEG (for gray images) or a low-fidelity symbol based compression scheme (for bi-level images). A signed hardcopy document is then printed that includes the bitmap image and an authentication token. The authentication token is encoded in the signed hardcopy document using either serpentine halftone patterns or data glyphs. The authenticity of the signed hardcopy document is verified by inputting a scanned bitmap image of the signed hardcopy document into the signature verification system. Once received, the signature verification system decodes, authenticates, and decompresses the bitmap image to define decompressed image data. The decompressed image data is then output to a display or printer and compared with the signed hardcopy document to determine whether it is authentic.
61 Citations
23 Claims
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1. A method for authenticating a hardcopy document, comprising the steps of:
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recording in a memory a scanned representation of the hardcopy document at a selected resolution; generating lossy compressed image data with the scanned representation of the hardcopy document; producing an authentication token with the lossy compressed image data;
the authentication token including one of encrypted image data and hashed encrypted image data;
the hashed encrypted image data including the lossy compressed image data and an encrypted hash of the lossy compressed image data; andarranging in the memory the scanned representation of the hardcopy document with a digital encoding of the authentication token for rendering at a printer a signed and authenticated hardcopy document. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for authenticating a hardcopy document, comprising the steps of:
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recording in a memory a scanned representation of the hardcopy document at a selected resolution; lossy compressed image data with the scanned representation of the hardcopy document; producing an authentication token with the lossy compressed image data;
the authentication token including one of encrypted image data and hashed encrypted image data;
the hashed encrypted image data including the lossy compressed image data and an encrypted hash of the lossy compressed image data; andarranging in the memory a digital encoding of the authentication token for rendering at a printer a label containing the digital encoding of the authentication token. - View Dependent Claims (19, 20)
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21. A system for authenticating a scanned representation of a hardcopy document, comprising:
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an image compression module for generating lossy compressed image data with the scanned representation of the hardcopy document; an authentication token generator for producing an authentication token with the lossy compressed image data;
the authentication token including one of encrypted image data and hashed encrypted image data;
the hashed encrypted image data including the lossy compressed image data and an encrypted hash of the lossy compressed image data; andan encoding module for arranging the scanned representation of the hardcopy document with a digital encoding of the authentication token for rendering at a printer a signed and authenticated hardcopy document. - View Dependent Claims (22, 23)
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Specification