cryptography enhances security

A great article on the limits of cryptography, as well as common misconceptions :
http://blogs.msdn.com/b/ericlippert/archive/2011/09/27/keep-it-secret-keep-it-safe.aspx

hacker howto

http://catb.org/~esr/faqs/hacker-howto.html

Teach Yourself Programming in Ten Years