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Electronic document verification system and method    
United States Patent5606609   
Link to this pagehttp://www.wikipatents.com/5606609.html
Inventor(s)Houser; Peter B. (Poway, CA); Adler; James M. (Ocean Beach, CA)
AbstractThe integrity or the signator of an electronic document can be verified by embedding a security object, for example, supported by an object linking and embedding (OLE) capability, in the electronic document at a location selected by the signator. The embedded security object includes security information and an identifier for invoking the processing of the security information. The security information may include a document digest that characterizes the electronic document at the time the security object was embedded, a signature digest that identifies the signator and that characterizes the instance of the embedded security object, and the signator's electronic chop, which may be the signator's digitized signature or other graphic image. In addition, the security information can be encrypted using either private key encryption or public key encryption. When the electronic document is later displayed, the identifier invokes processing that decrypts the security information and calculates the document digest based on the current state of the electronic document. The signator of the electronic document can be verified based upon the result of the decryption. The integrity of the electronic document can be verified if the decrypted document digest matches the calculated document digest. If the signator and the document integrity are confirmed, the electronic chop is displayed in the document. If, however, the signator or document integrity are not verified, the electronic chop is not displayed. In addition, a warning message may be displayed if verification fails.
   














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Drawing from US Patent 5606609
Electronic document verification system and method - US Patent 5606609 Drawing
Electronic document verification system and method
Inventor     Houser; Peter B. (Poway, CA); Adler; James M. (Ocean Beach, CA)
Owner/Assignee     Scientific-Atlanta (Norcross, GA)
Patent assignment
All assignments
Publication Date     February 25, 1997
Application Number     08/306,447
PAIR File History     Application Data   Transaction History
Image File Wrapper   Patent Term   Fees
Litigation
Filing Date     September 19, 1994
US Classification     713/179 382/306 713/167 715/515 715/516
Int'l Classification     H04L 009/00
Examiner     Cain; David C.
Assistant Examiner    
Attorney/Law Firm     Banner & Witcoff, Ltd.
Address
Parent Case    
Priority Data    
USPTO Field of Search     380/23 380/54 380/4 380/25
Patent Tags     electronic document verification
   
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 References Submit all comments and votes
 
*references marked with an asterisk below are user-added references
 U.S. References
 
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ReferenceRelevancyCommentsReferenceRelevancyComments
5373561
Haber
713/157
Dec,1994
[0 after 0 votes]		5319710
Atalla
705/75
Jun,1994
[0 after 0 votes]
5311595
Bjerrum
713/169
May,1994
[0 after 0 votes]		5299263
Beller
380/30
Mar,1994
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5297206
Orton

Mar,1994
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Kapp

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Wilson

Mar,1994
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Heckman
399/3
Mar,1994
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Jones

Feb,1994
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Monroe
713/186
Dec,1993
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Monroe
705/75
Nov,1993
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Sakurai
705/67
Sep,1993
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Kapp
178/18.03
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Balabon
380/243
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Angebaud

Jun,1993
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Keiser, II
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Vollert
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Shenton
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Mowry, Jr.
283/93
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Wicker

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Kapp
705/75
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Graziano
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Blandford
713/178
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Orndorff

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Maurer
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Pogue, Jr.
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Guillou
713/180
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Siemiatkowski
235/375
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Haber
713/178
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Haber
713/178
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Camion
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Dziewit
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Hilton
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Takaragi
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Fischer
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Chaum
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Schnorr
713/169
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Chaum
380/30
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Chaum
705/69
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Dziewit
713/176
Jan,1991
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Ohta
713/180
Nov,1990
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McDonald
705/65
Oct,1990
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Shamir
713/180
Jun,1990
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Goldwasser
713/180
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Yu
713/167
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Brachtl
713/187
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Philibert
382/100
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Takaragi
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Fischer
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Pastor
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Watanabe

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Tucker
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Shamir
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Matyas
713/185
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Rivest
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Mollier
713/181
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Hellman
380/30
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Okamoto
713/176
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Mollier
713/181
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Rivest
705/61
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Merkle
713/177
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Hellman
380/30
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Matyas
713/180
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Mayer, Jr.
356/71
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 Market Review Submit all comments and votes
   
Market Size
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> $10B
$5B - $10B
$2B - $5B
$500M - $2B
$100M - $500M
$10M - $100M
$1M - $10M
$500K - $1M
$100K - $500K
< $100K
[No votes]
$0
 
$0   $2.5B   $5B   $7.5B   $10B
Market Share
Estimate the percentage of the relevant market sector this invention will capture:
75% - 100%
50% - 74.99%
25% - 49.99%
10 - 24.99%
5 - 9.99%
2 - 4.99%
1 - 1.99%
< 1%
[No votes]
0.0%
 
0%   25%   50%   75%   100%
Reasonable Royalty
What percentage of gross sales should the inventor or assignee be paid?
75% - 100%
50% - 74.99%
25% - 49.99%
10 - 24.99%
5 - 9.99%
2 - 4.99%
1 - 1.99%
< 1%
[No votes]
0.0%
 
0%   25%   50%   75%   100%