Open Source Obfuscators in Java

The jarg reduces the size of a jar file in which java class files are stored. \"Size curtailment can be carried out simply\" is the 1st target. However, as a result of processing by jarg, since a Java class file is optimized, it becomes quicker, and since it is renamed, it becomes that it is harder to be analyzed. That is, jarg is 'Java Optimizer', and it is 'Java Obfuscator' and is also 'Java Shrinker' or 'Java Reducer'.

JavaGuard is a general purpose bytecode obfuscator, designed to fit effortlessly into your regular build and testing process, providing peace of mind that your valuable Java code is more secure against decompilation and other forms of reverse engineering.

JODE is a java package containing a decompiler and an optimizer for java. The optimizer transforms class files in various ways with can be controlled by a script file. It supports the following operations: * Renaming class, method, field and local names to shorter, obfuscated, or unique names or according to a given translation table * Removing debugging information * Removing dead code (classes, fields, methods) and constant fields * Optimizing local variable allocation

ProGuard is a free Java class file shrinker and obfuscator. It can detect and remove unused classes, fields, methods, and attributes. It can then rename the remaining classes, fields, and methods using short meaningless names. The resulting jars are smaller and harder to reverse-engineer.

The RetroGuard bytecode obfuscator modifies the contents of your class files in such a way that their behaviour is unaffected, while minimizing the amount of information from the source code that is exposed. A side effect of obfuscation is that the class size is reduced, leading to faster download times for your Java applets and applications.

yGuard is an improved version of RetroGuard that comes with an ant task.