Patent US4890770A successfully refreshed from Google Patents.
Patent EP0600646A2 successfully refreshed from Google Patents.
EP0600646A2
Expired / Lapsed
EP
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Secure document and method and apparatus for producing and authenticating same
Assignee: Pitney Bowes Inc
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Filing: 1993-11-19
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Granted: —
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Expires: 2013-11-19
Abstract
Abstract A document secure against tampering or alteration and method and apparatus for producing and authenticating such a document. A document is scanned to produce a digital signal which is compressed, encrypted, and coded as a two dimensional barcode or as some other appropriate form of coding, which is incorporated into a label which is the affixed to the document. In one embodiment the signal representing the image is encrypted using a public key encryption system and the key is downloaded from a center. This key maybe changed from time to time to increase security. To facilitate authentication the corresponding decryption key is encrypted with another key and incorporated on the card. To validate the document the coded signal is scanned from the label, decoded, decrypted, expanded and displayed. The card may then be authenticated by comparison of the displayed representation of the image and the document. <IMAGE>
Inventors
- 👤 William Berson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 08:51
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/44; H04N1/4406; H04N1/4426; G; G07; G07F; G07F7/00; G07F7/08; G07F7/12; H04L; H04L9/00; H04L9/32; H04L9/3247; H04L2209/00; H04L2209/30; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3233; H04N2201/3236; H04N2201/3271; H04N2201/328; H04N2201/3281; H04N2201/3283
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
123 words
A method of producing and authenticating a secure document comprising the steps of: a) scanning said document to produce a first signal representative of an image of said at least a portion of said document; b) encrypting a second signal, comprising a representation of said image, said second signal being derived at least in part from said first signal; c) incorporating a coded representation of said encrypted second signal with said document; d) reading said coded representation of said second signal from said document; e) decoding said second signal: f) decrypting said decoded second signal; g) inputting said decrypted second signal to a display to display said representation of said image; h) comparing said document to said displayed image to authenticate said document.
Claim 2
Dependent Claim
19 words
A method as claimed in claim 1 wherein said second signal comprises a compressed form of said first signal.
Claim 3
Dependent Claim
29 words
A method as claimed in claim 1 or claim 2 wherein said second signal is encrypted using an encryption key, E i , for a public key encryption system.
Claim 4
Dependent Claim
38 words
A method as claimed in claim 3 wherein a decryption key, D i , corresponding to said encryption key, E i , is encrypted with a second encryption key, E l , for said public key encryption system.
Claim 5
Dependent Claim
30 words
A method as claimed in claim 4 wherein said encrypted decryption key, E l [D i ], is appended to said encrypted second signal prior to incorporation with said document.
Claim 6
Dependent Claim
25 words
A method as claimed in claim 5 wherein said representation of said encrypted second signal is incorporated with said document as a two dimensional barcode.
Claim 7
Dependent Claim
35 words
A method as claimed in claim 5 wherein decryption of said encrypted second signal comprises the further steps of decrypting said encrypted key, E l [D i ] using a decryption key, D l .
Claim 8
Independent Claim
26 words
A method as claimed in any of claims 2 to 7 wherein said encrypted second signal is incorporated with said document as a two dimensional barcode.
Claim 9
Independent Claim
25 words
A method as claimed in any preceding claim wherein said coded representation is incorporated into a label and said label is affixed to said document.
Claim 10
Independent Claim
102 words
A method for authenticating a document, said document having a coded representation of an encrypted signal comprising a representation of an image of at least a portion of said document, with said document, comprising the steps of: a) reading said coded representation of said signal from said document, b) decoding said coded representation of said signal; c) decrypting said encrypted representation of said signal; and, d) inputting said decrypted representation of said signal to a display for displaying said representation of said image; whereby, e) said document may be authenticated by comparison of said document with said displayed representation of said image.
Claim 11
Dependent Claim
26 words
A method as claimed in claim 10 wherein said encrypted signal is encrypted using an encryption key, E i , for a public key encryption system.
Claim 12
Dependent Claim
111 words
A method as claimed in claim 11 wherein a decryption key, D i corresponding to said key E l , is encrypted with a second encryption key E l for said public key encryption system to form an encrypted decryption key, E i [D i ], and said encrypted decryption key, E l [D i ] is appended to said encrypted signal, and wherein said decryption step further comprises the steps of: a) decrypting said encrypted decryption key, E l [D i ] with a corresponding decryption key, D l , to recover said decryption key D i ; and, b) decrypting said encrypted signal with said key, D i .
Claim 13
Dependent Claim
114 words
Apparatus for authenticating a document, said document having a coded representation of an encrypted signal compressing a representation of a image of at least a portion of said document incorporated with said document, comprising: a) means for reading said coded representation of said signal from said document; b) decoding means, responsive to said reading means for decoding said coded representation of said signal; c) decrypting means, responsive to said decoding means, for decrypting said decoded representation of said signal, and, d) display means, responsive to said decrypting means, for displaying said representation of said image: whereby, e) said document may be authenticated by comparison of said document with said displayed representation of said image.
Claim 14
Dependent Claim
26 words
An apparatus as claimed in claim 13 wherein said encrypted signal is encrypted using an encryption key, E i , for a public key encryption system.
Claim 15
Dependent Claim
105 words
Apparatus as claimed in claim 14 wherein a decryption key, D i , corresponding to said key E i , is encrypted with an encryption key E₁ for said public key encryption system to form an encrypted decryption key E₁[D i ], and said encrypted decryption key E l [D i ] is appended to said encrypted signal, and said decrypting means further comprises: a) means for decrypting said encrypted decryption key, E₁[D i ] with a corresponding decryption key, D l , to recover said decryption key, D i ; and b) means for decrypting said encrypted signal using said key, D i .
Claim 16
Dependent Claim
24 words
A document, comprising an encoded representation of an encrypted signal comprising a representation of an image of at least a portion of said document.
Claim 17
Dependent Claim
25 words
A document as claimed in claim 16 wherein said digital signal is encrypted using an encryption key, E i, for a public key encryption system.
Claim 18
Dependent Claim
69 words
A document as claimed in claim 17 wherein a decryption key, D i , corresponding to said encryption key, E i , is encrypted with a second encryption key, E₁, for said public key encryption system to produce an encrypted description key, E l [D i ], and said encrypted decryption key, E l [D i ], is appended to said digital signal prior to incorporation with said document.
Claim 19
Dependent Claim
26 words
A document as claimed in claim 16 wherein said representation of said encrypted digital signal is incorporated with said document portion as a two dimensional barcode.
Claim 20
Dependent Claim
34 words
A label for securing in, to or in association with an associated document, said label incorporating an encoded representation of an encrypted signal, said signal comprising a representation of an image of said document.
References Cited (Backward Citations)
No citation records indexed.
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