System and method for securely duplicating digital documents

• US 20070033410A1
• Filed: 10/13/2006
• Published: 02/08/2007
• Est. Priority Date: 01/31/2002
• Status: Active Grant

• Current Assignee: Evidence Exchange, LLC
• Original Assignee: Michael Prounis, Myron Eagle
• Inventors: Prounis, Michael, Eagle, Myron
• Granted Patent: US 7,574,744 B2
• Time in Patent Office: Days
• US Class Current: 713/176
• CPC Class Codes: G06F 21/64 Protecting data integrity, e.g. using checksums, certificates or signatures
• CPC Class Codes: G06F 2221/2107 File encryption

Abstract

A system and method is provided for securely duplicating digital documents of disparate types, such that there is a cryptographically secure link between the duplicate and the original. The system also provides each document with a serial number that is both sequential with all other copied documents and cryptographically linked with the document itself, and which includes verifiable proof against tampering and modification. The system further produces copies of documents in a canonical format suitable for indexing and searching using automated processing tools.

Claims

1. A system for duplicating documents of disparate types for facilitating searching of such documents, said system comprising:

storage means for storing at least one original file, each containing no more than one original document, said original file being in a first format;

processing means for determining that said original document is a component document of a compound document, extracting said component document from said compound document and storing said component document in said original file; and

conversion means for converting said original file from said first format to a canonical format thereby generating a duplicate file containing a duplicate document of said original document, whereby searching of such documents is facilitated.

2. The system of claim 1, wherein said storage means has a directory structure, said component document being stored in said storage means under a directory associated with said compound document.

3. The system of claim 2, further comprising:

duplicate storage means for storing said duplicate file, said duplicate storage means having a directory structure identical to the directory structure of said storage means storing said original file.

4. The system of claim 2, wherein said compound document includes an additional component document, said processing means further for extracting said additional component document from said compound document and storing said additional component document in an additional original file in said storage means under said directory associated with said compound document in a hierarchical format designed to preserve the hierarchical relationship between said component document, said additional component document and said compound document.

5. The system of claim 4, wherein said component document and said additional component document are stored in a sub-directory of said directory associated with said compound document.

6. The system of claim 1, wherein said canonical format is the Portable Document Format (PDF), and further comprising:

searching means for enabling full-text searching of said duplicate documents.

7. The system of claim 1, wherein said compound document is an electronic mail folder, an electronic mail message having one or more attachments thereto, an electronic mail message having one or more additional electronic mail messages embedded therein, an execution file or a zip file.

8. The system of claim 1, further comprising:

appending means for appending a filename to said original file; and

renaming means for renaming said duplicate file in a sequenced format based on said filename of said original file.

9. The system of claim 1, further comprising:

selection means for enabling selection of said component document from said compound document for storage in said storage means.

10. A system for validating the authenticity of digital documents of disparate types, comprising:

storage means for storing a duplicate file containing a duplicate document of an original document in an original file having an original format, said duplicate file having a canonical format;

embedding means for embedding notary data associated with said duplicate file within said duplicate file; and

validation means for authenticating said duplicate file using at least said notary data associated with said duplicate file.

11. The system of claim 10, wherein said embedding means for embedding said notary data associated with said duplicate file into said duplicate file further comprises:

creation means for creating a hole in said duplicate file;

original notarization means for determining said notary data associated with said duplicate file by computing a hash value over the contents of said duplicate file excluding said hole; and

storage means for storing said notary data associated with duplicate file within said hole.

12. The system of claim 11, wherein said validation means further comprises:

extraction means for extracting said notary data associated with said duplicate file from said hole;

validating notarization means for determining new notary data associated with said duplicate file by computing an additional hash value over the contents of said duplicate file excluding said hole; and

comparison means for enabling comparison of said extracted notary data with said new notary data to authenticate said duplicate file.

13. A system for validating the authenticity of an original document from a duplicate document of said original document, comprising:

storage means for storing an original file containing said original document and a duplicate file containing said duplicate document, said original file having an original format, said duplicate file having a canonical format;

embedding means for embedding notary data associated with said original file within said duplicate file; and

validation means for authenticating said original file using at least said notary data associated with said original file.

14. The system of claim 13, wherein said validation means further comprises:

determining means for determining said original file from said duplicate file;

extraction means for extracting said notary data associated with said original file from said duplicate file;

notarization means for determining new notary data associated with said original file; and

comparison means for comparing said new notary data with said extracted notary data to authenticate said original file.

15. A method for duplicating digital documents of disparate types for facilitating searching of such documents, comprising the steps of:

determining whether an original document is a component document of a compound document;

if said original document is a component document, extracting said original document from said compound document;

storing said original document in an original file within a computer system, said original file being in an original format; and

converting said original file from said original format to a canonical format, thereby generating a duplicate file containing a duplicate document of said original document, whereby the searching of such documents is facilitated.

16. The method of claim 15, wherein said step of storing further comprises the step of:

storing said original file and said duplicate file in identical directory structures.

17. The method of claim 16, wherein said compound document includes an additional component document, and further comprising the steps of:

extracting said additional component document from said compound document; and

storing said additional component document in an additional original file under a directory associated with said compound document in a hierarchical format designed to preserve the hierarchical relationship between said component document, said additional component document and said compound document.

18. The method of claim 17, wherein said step of storing said additional component document further comprises the step of:

storing said component document and said additional component document in a sub-directory of said directory associated with said compound document.

19. The method of claim 15, wherein said canonical format is the Portable Document Format (PDF), and further comprising the step of:

enabling full-text searching of said duplicate documents.

20. The method of claim 15, further comprising the steps of:

appending a filename to said original file; and

renaming said duplicate file in a sequenced format based on said filename of said original file.

21. The method of claim 15, further comprising the step of:

enabling selection of said component document from said compound document for file conversion and storage.

22. A method for validating the authenticity of digital documents of disparate types, comprising the steps of:

retrieving a duplicate file containing a duplicate document of an original document in an original file having an original format, said duplicate file having a canonical format, said duplicate file further having notary data associated with said duplicate file embedded within said duplicate file; and

authenticating said duplicate file using at least said notary data associated with said duplicate file.

23. The method of claim 22, wherein said notary data is embedded into a hole within said duplicate file, said notary data being determined by computing a hash value over the contents of said duplicate file excluding said hole.

24. The method of claim 23, wherein said step of authenticating further comprises the steps of:

extracting said notary data associated with said duplicate file from said hole;

determining new notary data associated with said duplicate file by computing an additional hash value over the contents of said duplicate file excluding said hole; and

enabling comparison of said extracted notary data with said new notary data to authenticate said duplicate file.

25. A method for validating the authenticity of an original document from a duplicate document of said original document, said method comprising the steps of:

retrieving a duplicate file containing a duplicate document of an original document in an original file having an original format, said duplicate file having a canonical format, said duplicate file further having notary data associated with said original file embedded within said duplicate file; and

authenticating said original file using at least said notary data associated with said original file.

26. The method of claim 25, wherein said step of authenticating further comprises the steps of:

determining said original file from said duplicate file;

extracting said notary data associated with said original file from said duplicate file;

determining new notary data associated with said original file; and

comparing said new notary data with said extracted notary data to authenticate said original file.

27. A duplicate document of an original document, comprising:

at least one page;

a footer at the bottom of each said at least one page; and

a unique sequence number inserted in said footer, said unique sequence number including at least a portion of notary data associated with the original document to provide a cryptographically secure link between the duplicate document and the original document.