Bill Cochran

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The sufficiency claim goes in here

A C++ version of PURG can be obtained here.

PURG combines two random number generators: a hash-based sufficient generator and another generator. As such, two seeds are needed.

PURG has a parallel random number generator and four serial generators. To use, instantiate a generator:

          purg::rng rng ( time ( null ) , "long seed" , 9 );

SPRNG	Scalable Parallel Pseudo Random Number Generators Library.

MT	Mersenne Twister homepage.

FIPS 186	Digital Signature Standard. Appendix 2.1 details using one-way hash function as a PRNG.

SHA	Wikipedia page describing the Secure Hash Algorithm family of hash functions

Statement of research interests

Mailing address:

Bill Cochran
4332 Siebel Center
201 N. Goodwin Ave.
Urbana, IL 61801-2302

Phone: (217) 390-5679

A complete curriculum vitae can be downloaded here.

10/2009	Ph.D. in Computer Science University of Illinois, Urbana-Champaign A Generic Mesh Data Structure with Parallel Applications

12/1999	B.S. in Computer Science Wake Forest University

1/2009 - present	Research Assistant Center for the Simulation of Advanced Rockets University of Illinois, Urbana-Champaign Developed mesh partitioners for large scale engineering simulations on parallel supercompters

1/2008 - 12/2008	Vice President of Research and Development Imagineer Software, Inc., Milwaukee, WI Developed authentication protocols and prototypes for several applications including click-fraud prevention, copy protection, and secure web access.

8/2001 - 12/2007	Research Assistant Center for the Simulation of Advanced Rockets University of Illinois, Urbana-Champaign Developed mesh partitioners for large scale engineering simulations on parallel supercompters

1/2000 - 8/2001	Systems Programmer IMS, Inc., Silver Spring, MD Maintained Java front-end for database queries. Designed and implemented database and transaction server for large scale vaccine study. Maintained C/C++ database access code.

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7,376,624	W. Cochran, S. Gustman, and W. Sellars. Secure communication and real-time watermarking using mutating identifiers. 2008.

6,996,544	W. Sellars, W. Cochran, and D. Hunt. Multiple party content distribution system and method with rights management features. 2006.

20090125719	W. Cochran and S. Stubblebine. Methods of ensuring legitimate pay-per-click advertising.

20090125444	W. Cochran and S. Stubblebine. Graphical user interface and methods of ensuring legitimate pay-per-click advertising.

20090125398	W. Cochran and S. Stubblebine. Methods of computing advertising value through real-time auction.

20080228650	W. Cochran, S. Gustman, and W. Sellars. Secure communication and real-time watermarking using mutating identifiers.

20060195402	R. Malina and W. Cochran. Secure data transmission using undiscoverable or black data.

20060173794	W. Sellars, R. Malina, and W. Cochran. Secure electronic commerce using mutating identifiers.

20060031175	W. Sellars, W. Cochran, and D. Hunt. Multiple party content distribution system and method with rights management features.

20050010536	W. Cochran and S. Gustman. Secure communication and real-time watermarking using mutating identifiers.

20030187799	W. Sellars, W. Cochran, and D. Hunt. Multiple party content distribution system and method with rights management features.

WO 2007 092577	W. Sellars, R. Malina, and W. Cochran. A point-of-sale terminal transactions using mutating identifiers.

WO 2007 092588	W. Sellars, R. Malina, and W. Cochran. Secure digital content management using mutating identifiers.

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