Method and apparatus for incremental code signing

Details Method and apparatus for incremental code signing Method and apparatus for incremental code signing

2006-09-05

2006-09-05

Darrow, Justin T. (Department: 2132)

Electrical computers and digital processing systems: support

Computer program modification detection by cryptography

C713S190000, C726S022000

Reexamination Certificate

active

07103779

ABSTRACT:
The present invention discloses a method for quickly and easily authenticating large computer program. The system operates by first sealing the computer program with digital signature in an incremental manner. Specifically, the computer program is divided into a set of pages and a hash value is calculated for each page. The set of hash values is formed into a hash value array and then the hash value array is then sealed with a digital signature. The computer program is then distributed along with the hash value array and the digital signature. To authenticate the computer program, a recipient first verifies the authenticity of the hash value array with the digital signature and a public key. Once the hash value array has been authenticated, the recipient can then verify the authenticity of each page of the computer program by calculating a hash of a page to be loaded and then comparing with an associated hash value in the authenticated hash value array. If the hash values do not match, then execution may be halted.

REFERENCES:
patent: 2002/0194484 (2002-12-01), Bolosky et al.
patent: 0752786 (1997-01-01), None
patent: WO0163385 (2001-08-01), None
patent: WO0241147 (2002-05-01), None
patent: WO 2005/029223 (2006-02-01), None
B. Schneier, “Applied Cryptography, Second Edition: Protocols, Algorithms, and Source Code in C,” 1996, John Wiley & Sons, Inc., section 18.7, pp. 442-445.

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