Cryptographic Links

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Descriptions of Historical Ciphers: http://starbase.trincoll.edu/%7Ecrypto/historical/index.html

Letter Frequencies

A Tool for Cryptography: http://www.cryptool.com/

Enigma link: http://www.codesandciphers.org.uk/enigma/

The Lorenz Cipher, another WW II Cipher: http://www.codesandciphers.org.uk/lorenz/fish.htm

The Beale Treasure Cipher: http://www.myoutbox.net/blove.htm and http://www.simonsingh.net/Beale_Treasure_Ciphers.html

What is a Block Cipher: http://www.rsasecurity.com/rsalabs/node.asp?id=2168

The S-DES Cipher:  http://homepage.smc.edu/morgan_david/vpn/des.htm

The DES Cipher: http://www.rsasecurity.com/rsalabs/node.asp?id=2225

The Rijndael Cipher, the new AES Cipher: http://www.esat.kuleuven.ac.be/~rijmen/rijndael/ and http://www.ratchkov.com/vpn/aes/aes.html

The RC4 Stream Cipher: http://www.rsasecurity.com/rsalabs/node.asp?id=2250 and http://www.fact-index.com/r/rc/rc4_cipher.html

RSA, a Public Key System: http://www.rsasecurity.com/rsalabs/node.asp?id=2213

The RSA Factoring Challenge http://www.rsasecurity.com/rsalabs/node.asp?id=2094 and http://news.zdnet.com/2100-1009_22-5201037.html

An Example Using the Extended Euclidean Algorithm: http://marauder.millersville.edu/~bikenaga/absalg/exteuc/exteucex.html

Diffie-Hellman Key Exchange: http://gauss.ececs.uc.edu/Users/Franco/Project/dh.htm

A Hash Function Calculator: http://www.slavasoft.com/hashcalc/overview.htm

The Secure Hash Algorithm SHA-1: http://www.itl.nist.gov/fipspubs/fip180-1.htm

The MD-5 Hash Algorithm: http://www.freesoft.org/CIE/RFC/1321/3.htm

The MD-4 Hash Algorithm: http://www.networksorcery.com/enp/data/md4.htm and http://www.faqs.org/rfcs/rfc1320.html

DSS, the Digital Signature Standard: http://www.itl.nist.gov/fipspubs/fip186.htm

Netscape Certificates: http://wp.netscape.com/eng/security/ssl_2.0_certificate.html

Free Version of PGP: http://www.pgp.com/downloads/freeware/index.html