Hashing:
https://crackstation.net/hashing-security.htm
Crypto:
http://www.garykessler.net/library/crypto.html
Crypto for Gophers:
Hashing:
https://crackstation.net/hashing-security.htm
Crypto:
http://www.garykessler.net/library/crypto.html
Crypto for Gophers: