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Cryptographic security products, including Secure Socket Layer 3 for Java. [commercial]

Crypto toolkit based on FlexiProvider.

An open source cryptographic class library for the JCA/JCE architecture. [Open Source with registration]

Java implementation of the public key cryptosystem Hidden Field Equations (HFE). Also includes matrix and finite field operations. [Open source, GPL]

Provides a comprehensive set of Java-based crypto products. Java implementation TLS, SSLv3 and SSLv2(client side), S/MIMEv2. [Commercial]

A fully featured SSH2 library. By 3SP LTD. [Commercial]

Reimplemented the Java SDSI (Simple Distributed Security Infrastructure) API. [Open source, MIT License]

Provides framework and implementations for encryption, key generation and key agreement, and Message Authentication Code (MAC) algorithms.

Provides open source implentations of the Java Cryptography Extension 1.2.1, and a lightweight Java Cryptography API for the J2ME, and the JDK. [Open Source]

Libraries used internally by Netscape and iPlanet products that do crypto in Java. [Mozilla]

Public key signature system QuartzLight [Open Source, GPL].

Toolkits for SSL, general cryptography, and PKI. [Commercial]

The source code of the 128-bit PC1 cipher algorithm in Java.

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]