Patent US5388158A successfully refreshed from Google Patents.
US5388158A
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Secure document and method and apparatus for producing and authenticating same
Assignee: Pitney Bowes Inc
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Filing: 1992-11-20
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Granted: 1995-02-07
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Expires: 2012-11-20
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.
Inventors
- 👤 William Berson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:00
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: 12
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
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 3
Dependent Claim
17 words
A method as described in claim 1 further comprising converting said first signal into a digital signal.
Claim 4
Dependent Claim
19 words
A method as described in claim 2 wherein said second signal comprises a compressed form of said first signal.
Claim 5
Dependent Claim
26 words
A method as described in claim 3 where said second signal is encrypted using an encryption key, E i , for a public key encryption system.
Claim 6
Dependent Claim
38 words
A method as described in claim 4 wherein a decryption key, D i , corresponding to said encryption key, E i , is encrypted with a second encryption key, E 1 , for said public key encryption system.
Claim 7
Dependent Claim
30 words
A method as described in claim 5 wherein said encrypted decryption key, E 1 [D i ], is appended to said encrypted second signal prior to incorporation with said document.
Claim 8
Dependent Claim
25 words
A method as described in claim 6 wherein said representation of said encrypted second signal is incorporated with said document as a two dimensional barcode.
Claim 9
Dependent Claim
35 words
A method as described in claim 6 wherein decryption of said encrypted second signal comprises the further steps of decrypting said encrypted key, E 1 [D i ] using a decryption key, D 1 .
Claim 10
Dependent Claim
22 words
A method as described in claim 3 wherein said encrypted second signal is incorporated with said document as a two dimensional barcode.
Claim 11
Dependent Claim
24 words
A method as described in claim 2 wherein said coded representation is incorporated into a label and said label is affixed to said document.
Claim 12
Dependent Claim
24 words
A method as described in claim 1 wherein said coded representation is incorporated into a label and said label is affixed to said document.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-06 | 1998-08-08 | 1999-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-06 | 2002-08-08 | 2003-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-06 | 2006-08-08 | 2007-02-07 | $7700.00 | Window Closed / Lapsed |