Blowfish Algorithm Website: http://www.counterpane.com/blowfish.html Type: Class Key Size: Variable Length up to 448-bits Speed: 125kb/sec compiled (Pentium II) Note: One of the best algorithms in the industry.
Twofish Algorithm Website: http://www.counterpane.com/twofish.html Type: Class Key Size: 256-bits Speed: 110kb/sec compiled (Pentium II) Note: Blowfish's baby brother. Very secure.
Rijndael Algorithm Website: http://csrc.nist.gov/encryption/aes/ Type: Class Key Size: 128-bits Speed: Not tested Note: Rijndael is the new Advanced Encryption Standard (AES).
Skipjack Algorithm Website: http://csrc.nist.gov/encryption/tkencryption.html Type: Class Key Size: 80-bits Speed: Not tested Note: Property of the NSA. Patents apply for commercial use. Strong but iffy.
Serpent Algorithm Website: http://www.cl.cam.ac.uk/~rja14/serpent.html?uniq=1446 Type: Class Key Size: 256-bits Speed: 35kb/sec compiled (Pentium II) Note: Very slow implementation of the 256-bit version of Serpent. Still very secure.
Gost Algorithm Website: http://www.jetico.sci.fi/index.htm#/gost.htm Type: Class Key Size: 256-bits Speed: Not tested Note: Developed by the former USSR. Strong but has many notable weaknesses.
RC4 Algorithm Website: http://www.rsasecurity.com/rsalabs/faq/3-6-3.html Type: Class Key Size: Variable Length up to 2040-bits Speed: Very very fast (you'll see) Note: Property of RSA Labs (Patents apply for commercial use).
DES Algorithm Website: http://csrc.nist.gov/encryption/des/ Type: Class Key Size: 56-bits Speed: Not tested Note: Formerly known as Lucifer. Insecure by today's standards.