4C Security - Credits and Acknowledgments

4C uses the crypto library that is part of the OpenSSL package from The OpenSSL Project
Parts of the software used was developed by Eric Young and he owns the copyright to it.
View OpenSSL and SSLEay Licenses

The following books were helpful in understanding the complexities and issues involved in writing secure software and the issues involved in encryption algorithms.

Applied Cryptography by Bruce Schneier - This is the bible of cryptographic algorithms.
SSH The Secure Shell, The definitive guide from O'Reilly - This book was really helpful in that a lot of the issues that 4C needed to addresss are also addressed by SSH.
Network Security with OpenSSL, also from O'Reilly.
Crypto by Steven Levy - This book was an enjoyable read and gives a good history of cryptography. This book, like any book by Steven Levy is very worthwhile reading.