This site hosts the Enigma Codecs. Free Javascipt based encryption.

This is a javascript implementation of DES, the Data Encryption Standard, supporting ECB and CBC modes. It also includes a function for Triple DES.

An open source JavaScript implementation of the RC4, AES, Serpent, Twofish, Caesar and RSA ciphers.

Useful scripts for encrypting strings with MD5, MD4, and SHA-1 algorithms.

Implementation of the AES encryption algorithm Rijndael in JavaScript. Includes an interactive test page. [Open source]