How to: Encryption
* [bcrypt-ruby](https://github.com/codahale/bcrypt-ruby) - bcrypt-ruby is a Ruby binding for the OpenBSD bcrypt() password hashing algorithm.
* [RbNaCl](https://github.com/cryptosphere/rbnacl) - Ruby binding to the Networking and Cryptography (NaCl) library.
* [Sym](https://github.com/kigster/sym) - A time-saving symmetric encryption gem based on OpenSSL that uses 256bit (password-encrypted) keys. Read the key from STDIN, a file, ENV or, on a Mac: OS-X Keychain.
* [Symmetric Encryption](https://encryption.rocketjob.io/) - Transparently encrypt ActiveRecord, Mongoid, and MongoMapper attributes. Encrypt passwords in configuration files. Encrypt entire files at rest.
* [Themis](https://github.com/cossacklabs/themis) - crypto library for painless data security, providing symmetric and asymmetric encryption, secure sockets with forward secrecy, for mobile and server platforms.