http://www.cryptopp.com/benchmarks.html
http://en.wikipedia.org/wiki/Block_size_(cryptography)
http://en.wikipedia.org/wiki/Block_cipher
http://www.jetico.com/linux/bcrypt-help/c_gloss.htm
http://www.codeproject.com/dotnet/CastEncryptor.asp
http://community.roxen.com/developers/idocs/rfc/rfc2984.html
http://www.commsdesign.com/main/9811/9811feat3.htm
http://www.answers.com/topic/feistel-cipher
http://www.ciphersbyritter.com/NEWS/95050101.HTM
http://www.faqs.org/faqs/cryptography-faq/part07/
http://www.cescomm.co.nz/about/aes.html