SessionKeys is a cryptographic tool for the deterministic generation of NaCl compatible Curve25519 encryption and Ed25519 digital signature keys. The strength of the system is rooted in the fact that the keypairs are derived from passing an identifier, such as a username or email...

Rails engine for password strength checking

Password Validators including Dropbox ZXCVBN algorithim

Basically just a wrapper around existing hashing/encrypting methods.