Rabbit Hole of Research #1
https://www.benburwell.com/posts/your-website-is-not-special-dont-make-visitors-make-accounts/
http://codahale.com/how-to-safely-store-a-password
http://www.win.tue.nl/cccc/sha-1-challenge.html
http://en.wikipedia.org/wiki/Secure_Hash_Algorithm#SHA-0_and_SHA-1
http://en.wikipedia.org/wiki/Cryptographic_hash_function
http://en.wikipedia.org/wiki/Birthday_attack