System and method for authentication of transformed documents
View Patent ↗A document verification system and method verifies that a content of two documents match based on comparison of an authentication signature generated from each of the documents. The documents may be electronic text documents and may be transformed representations of each other through imaging, printing or image processing. Authentication signatures can be encrypted to enhance security and identify document sources. An authentication signature can be generated for an entirety or portions of the document. Multiple authentication signatures may be generated for each document for selected document regions. The authentication signature can be stored electronically or in hard copy and can be machine-readable to be automatically interpreted by a machine.
1. A method for verifying matching content between a plurality of text documents implemented with a numerical computation device, comprising:
at a first location, forming a first authentication signature from an electronic text character content of a first text document;
obtaining a document representation that is a transformation of the first text document, where the document representation represents the electronic text characters converted to a format that is other than electronic text;
electronically transmitting the document representation to a second location;
electronically storing a second text document derived from the document representation;
forming a second authentication signature from an electronic text character content of the stored second text document; and
comparing the first and second authentication signatures.
2. The method according to claim 1 , further comprising transforming an image document to form one or more of the text documents.
3. The method according to claim 1 , further comprising computing a checksum from one or more of the text documents to form the first or second authentication signatures.
4. The method according to claim 1 , further comprising indicating a failed verification when a result of comparing the first and second authentication signatures indicates no match.
5. The method according to claim 1 , further comprising forming a plurality of authentication signatures for one or more of the text documents.
6. The method according to claim 1 , further comprising forming one or more of the authentication signatures to be machine-readable.
7. The method according to claim 1 , further comprising encrypting one or more of the authentication signatures.
8. The method according to claim 1 , wherein comparing is performed automatically by a machine.
9. The method according to claim 1 , further comprising transforming one or more of the text documents to an image document.
10. The method according to claim 1 , further comprising transforming one or more of the text documents to a paper document.
11. The method according to claim 9 , further comprising transforming the image document to a paper document.
12. The method according to claim 10 , further comprising transforming the paper document to an image document.
13. The method according to claim 1 , further comprising transmitting the document representation by facsimile.
14. The method according to claim 1 , further comprising storing one or more of the authentication signatures.
15. The method according to claim 1 , further comprising forming one or more of the authentication signatures with symbolic indicia.
16. The method according to claim 6 , further comprising forming one or more of the authentication signatures with symbolic indicia.
17. The method according to claim 15 , wherein the symbolic indicia includes alphanumeric characters.
18. The method according to claim 16 , wherein the symbolic indicia includes alphanumeric characters.
19. A system for verifying matching content between a plurality of text documents, comprising:
a storage device for storing in electronic form an authentication signature generated from electronic text characters from an electronic form of a first text document;
a processor communicatively coupled to the storage device and being operative to access the authentication signature generated from the electronic text characters from the electronic form of the first text document and being further operative to:
electronically obtain an image document;
store the image document in the storage device;
transform the image document to a second electronic text document;
generate an authentication signature from the second electronic text document; and
compare authentication signatures respectively generated from the first and second electronic text documents for a match.
20. The system according to claim 19 , wherein the processor is further operative to generate a checksum from one or more of the electronic text documents to contribute to forming an authentication signature.
21. The system according to claim 19 , further comprising an authentication signature reader communicatively coupled to the processor for reading an authentication signature in machine-readable format.
22. The system according to claim 19 , wherein the processor is further operative to generate an encryption of an authentication signature.
23. The system according to claim 19 , further comprising a storage device for storing one or more of the authentication signatures.
24. The method according to claim 1 , further comprising transmitting the first authentication signature with the document representation.
25. The method according to claim 24 , wherein the first authentication signature is transmitted with and separate from the document representation.
26. The system according to claim 19 , wherein the image document is electronically received via facsimile reception.
27. The system according to claim 19 , wherein the processor is operable to electronically receive the first authentication signature.
28. The system according to claim 27 , wherein the first authentication signature is received with and separate from the image document.
29. A method for verifying matching content between a plurality of text documents implemented with a numerical computation device, comprising:
electronically obtaining an image document derived from a first electronic text document;
electronically obtaining a first authentication signature generated from the first electronic text document;
transforming the image document to a second electronic text document;
generating a second authentication signature from the second electronic text document; and
determining if the first and second authentication signatures meet a match criterion.
30. The method according to claim 29 , wherein obtaining includes receiving.
31. A method for verifying matching content between a plurality of text documents implemented with a numerical computation device, comprising:
forming a first authentication signature from a first electronic text character content of a first text document;
obtaining a first document representation that is a transformation of the first text document, wherein the first document representation represents the first electronic text character content provided in a format that is other than electronic text;
obtaining a second document representation derived as a transformation of the first document representation, where the second document representation represents the first electronic text character content provided in a format that is other than electronic text;
transforming the second document representation to a second text document that includes a second electronic text character content;
forming a second authentication signature from the second electronic text character content of the second text document; and
determining if the first and second authentication signatures meet a match criterion.