Patent US6487301B1 successfully refreshed from Google Patents.
US6487301B1
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Digital authentication with digital and analog documents
Assignee: Mediasec Technologies LLC
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Filing: 2001-06-05
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Granted: 2002-11-26
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Expires: 2021-06-05
Abstract
Abstract Techniques for incorporating authentication information into digital representations of objects and using the authentication information to authenticate the objects. The authentication information may be made from information in one portion of the digital representation and incorporated into another portion of the digital representation that does not overlap the first portion. Where the digital representation is made into an analog form and that in turn is made into a digital representation and the second digital representation is verified, the two portions must further be non-overlapping in the analog form. The information from which the authentication information is made may exist at many levels: representations of physical effects produced by the object, representations of features of the object, codes that represent the object's contents, and representations of descriptions of the object. Also disclosed are a verification server and techniques for reducing errors by an OCR. The verification server verifies authenticated documents. When a document is verified, an identifier is associated with the document and the identifier is used to locate a key for the authentication information and in some cases a second copy of the authentication information. The verification process may also involve security patterns that are a physical part of the analog form. The error reduction techniques include an error code specifying characters in the object that are confusing to OCR devices, and the error code is used to correct the results of an OCR reading of an analog form.
Inventors
- 👤 Jian Zhao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:40
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/80; H04N21/83; H04N21/835; H04N21/8358; G; G06; G06F; G06F21/00; G06F21/10; G06F21/16; G06T; G06T1/00; G06T1/0021; G06T1/005; G07; G07D; G07D7/00; G07D7/004; H04N1/00; H04N1/32; H04N1/32101; H04N1/32128; H04N1/32133; H04N1/32144; H04N1/32149; H04N1/32203; H04N1/32208; H04N1/32213; H04N1/32267; H04N1/32283; H04N7/00; H04N7/16; H04N7/167; H04N7/1675; G06T2201/00; G06T2201/005; G06T2201/0065; H04N1/32106; H04N1/32122; H04N2201/00; H04N2201/32; H04N2201/3201; H04N2201/3225; H04N2201/3226; H04N2201/3233; H04N2201/3235; H04N2201/3236; H04N2201/3269; H04N2201/327; H04N2201/3271; H04N2201/328; H04N2201/3281
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
98 words
Apparatus which authenticates a digital representation of an object from which an analog form may be made, the apparatus comprising: an authenticator which uses first information in a first portion of the digital representation to produce first authentication information, the first information also being obtainable from a third portion of the analog form that is made from the first portion; and an incorporator which incorporates the first authentication information in a second portion of the digital representation, the authentication information also being obtainable from a fourth portion of the analog form that is made from the second portion.
Claim 2
Dependent Claim
98 words
Apparatus which authenticates a digital representation of an object from which an analog form may be made, the apparatus comprising: an authenticator which uses first information in a first portion of the digital representation to produce first authentication information, the first information also being obtainable from a third portion of the analog form that is made from the first portion; and an incorporator which incorporates the first authentication information in a second portion of the digital representation, the authentication information also being obtainable from a fourth portion of the analog form that is made from the second portion.
Claim 3
Dependent Claim
48 words
The apparatus set forth in claim 1 wherein: the digital representation includes items of data, each item has more significant components and less significant components, the first portion is certain more significant components of the item, and the second portion is certain less significant components of the item.
Claim 4
Dependent Claim
20 words
The apparatus set forth in claim 2 wherein: the items are pixels and the components are bits in the pixels.
Claim 5
Dependent Claim
22 words
The apparatus set forth in claim 2 wherein: the items are signal samples and the components are bits in the signal samples.
Claim 6
Dependent Claim
26 words
The apparatus set forth in claim 2 wherein: the items are DCT blocks containing frequency coefficients and the components are frequency coefficients in the DCT block.
Claim 7
Dependent Claim
37 words
The apparatus set forth in claim 1 wherein: the digital representation includes an image, the first portion is a first specific region of the image, and the second portion is a second specific region of the image.
Claim 8
Dependent Claim
34 words
The apparatus set forth in claim 1 wherein: the digital representation includes a document layer and an image layer, the first portion is the document layer, and the second portion is the image layer.
Claim 9
Dependent Claim
17 words
The apparatus set forth in claim 1 wherein: the first portion is vector data in the object.
Claim 10
Dependent Claim
17 words
The apparatus set forth in claim 1 wherein: the first portion is content codes in the object.
Claim 11
Dependent Claim
54 words
The apparatus set forth in claim 9 wherein: The content codes are codes that represent alphanumeric characters; and the digital representation includes a document layer that contains the content codes and an image layer; and the first portion is the document layer and the second portion is a specific region of the image layer.
Claim 12
Dependent Claim
16 words
The apparatus set forth in claim 1 wherein: the first portion is metadata in the object.
Claim 13
Dependent Claim
64 words
Apparatus which authenticates a digital representation of an object, the digital representation including frequency components and the apparatus comprising: an authenticator which uses first information in more significant frequency components of the components to produce first authentication information; and an incorporator which incorporates the first authentication information into less significant frequency components of the components that do not overlap the more significant frequency components.
Claim 14
Dependent Claim
64 words
Apparatus which authenticates a digital representation of an object, the digital representation including frequency components and the apparatus comprising: an authenticator which uses first information in more significant frequency components of the components to produce first authentication information; and an incorporator which incorporates the first authentication information into less significant frequency components of the components that do not overlap the more significant frequency components.
Claim 15
Dependent Claim
26 words
The apparatus set forth in claim 12 wherein: the frequency components are coefficient values that represent significant frequency components that are computed by a perception model.
Claim 16
Dependent Claim
16 words
The apparatus set forth in claim 13 wherein: the perception model is an auditory perception model.
Claim 17
Dependent Claim
16 words
The apparatus set forth in claim 13 wherein: the perception model is a visual perception model.
Claim 18
Dependent Claim
16 words
The apparatus set forth in claim 12 wherein: the frequency components are contained in DCT blocks.
Claim 19
Dependent Claim
16 words
The apparatus set forth in claim 12 wherein: the first authentication information is a digital signature.
Claim 20
Dependent Claim
17 words
The apparatus set forth in claim 12 wherein: the first authentication information is a secure hash code.
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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) | 2005-11-25 | 2006-05-27 | 2006-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-11-25 | 2010-05-27 | 2010-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-11-25 | 2014-05-27 | 2014-11-26 | $7700.00 | Window Closed / Lapsed |