Legion of The Bouncy Castle - Provides open source implementations of the Java Cryptography Extension 1.2.1, and a lightweight Java Cryptography API for the J2ME, and the JDK. [Open Source] Java Cryptography Extension (JCE) - Provides framework and implementations for encryption, key generation and key agreement, and Message Authentication Code (MAC) algorithms. Network Security Services for Java (JSS) - Libraries used internally by Netscape and iPlanet products that do crypto in Java. [Mozilla] Hidden Field Equations (HFE) in Java - Java implementation of the public key cryptosystem Hidden Field Equations (HFE). Also includes matrix and finite field operations. [Open source, GPL] QuartzLight in Java - Public key signature system QuartzLight [Open Source, GPL]. IAIK Java Crypto Products - Provides a set of Java-based crypto products. Java implementation TLS, SSLv3 and SSLv2(client side), S/MIMEv2. [Commercial] JSDSI - Reimplemented the Java SDSI (Simple Distributed Security Infrastructure) API. [Open source, MIT License] FlexiCrypt - Crypto toolkit based on FlexiProvider. logi.crypto - Formerly Cryptonite, a pure java package for strong cryptography. It supplies RSA (usable outside of North America), DES, Triple-DES implementation as well as other utility classes. [Open Source, GPL/Commercial]