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Cryptography (or cryptology) is a discipline of mathematics and, in modern times, of computer science concerned with information security and related issues, particularly encryption and authentication and other applications such as access control.

Cryptography, as an interdisciplinary subject, draws on several fields. Prior to the early 20th century, cryptography was chiefly concerned with linguistic patterns. Since then, the emphasis has shifted, and cryptography now makes extensive use of mathematics, including aspects of information theory, computational complexity, statistics, combinatorics, and especially number theory. Cryptography is a branch of engineering, but an unusual one as it deals with active, intelligent and malevolent opposition (see cryptographic engineering and security engineering). There is also active research examining the relationship between cryptographic problems and quantum physics (see quantum cryptography and quantum computing).

Cryptography is a central part of the techniques used in computer and network security for such things as access control and information confidentiality. Cryptography is used in many applications that touch everyday life; the security of ATM cards, computer passwords, and electronic commerce all depend on cryptography.

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Calculating Pi - Investigates and implements algorithms which may yield to distributed computation of the mathematical constant Pi.
Meta Description: [ The open source project for calculating Pi. ]

distributed.net - A distributed computing project currently trying to take the RSA challenge of RC5-64, and also working on OGR-24 and 25 (Optimal Golomb Rulers). Previous projects included CSC and DES.

ECMNET - Project to factor numbers using the elliptic curve method. Client and server software.

404 Electronic Frontier Foundation - Cash prizes for discovery of very large prime numbers through Cooperative Computing Awards program.
Meta Description: [ Electronic Frontier Foundation is a nonprofit group working to protect your digital rights. ]

Ellipsa - Elliptic Curve Primality Proving - Primo, a primality proving program based on the ECPP algorithm. With Primo one can check crypto-primes and prove whether or not they are actually prime.
Meta Description: [ Ellipsa Homepage ]

Generalized Fermat Primes Search - Project provides software to search for primes of a specific form. Coordinated via email.
Meta Description: [ Generalized Fermat Prime Search. ]

Goldbach's Conjecture and Factoring the Cryptographic Modulus - Algebraic Factoring of the Cryptography Modulus and Proof of Goldbach's Conjecture

Great Internet Mersenne Prime Search - Online search for Mersenne prime numbers, found largest several primes.
Meta Description: [ An organized search for Mersenne prime numbers. Free software provided. ]

500 MM61 - Attempt at factoring the huge Mersenne number 2^(2^61-1)-1. Software for Windows, DOS and Linux. Work reservation via email.

RSA Security - Challenges - Monetary prizes for factoring certain large numbers (RSA Numbers), as well as breaking RSA and DES encryption schemes; announcements mailing list.

Search for the Largest Proth Prime - An internet group to help find the 5th largest prime number, coordinated by William Garnett. Windows/Linux software available.

Seventeen Or Bust - A distributed attack on the Sierpinski problem, trying to find the last remaining 17 numbers.

The Prime Pages - Prof. Chris Caldwell's database of virtually every large or otherwise interesting prime number known; includes the 5,000 largest known prime numbers and records for specific types.
Meta Description: [ Access to hundreds of pages of award-winning information on prime numbers--with links to thousands of pages elsewhere. We host the searchable database of the 5000 largest known primes (updated weekly). We also have a glossary, top 10 records lists, prime-music, programs, free downloads, an... ]

The Riesel Sieve Project - Distributed project to help solve the Riesel problem through the use of donated unused CPU cycles.

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