Stigmata

Overview

Stigmata is rewrite almost every source code based on jbirth which available at http://se.naist.jp/jbirth. Stigmata aims to detect the theft of programs, too. This tool can extract birthmarks from Java class files, and compare them. Differences from jbirth are

using spi (service provider interface) architecture for birthmark implementation
using ASM instead of BCEL.
introducing birthmarking context
implementing new birthmarks (k-gram, frequency of used classes, frequency of method calls)
new analysis method for extracted birthmarks
show extracted birthmark histories.

A software birthmark is a set of special informations that the program originally possesses. The software birthmark is carefully extracted from critical portions of class file. Hence, if a class file p has the same software birthmark as another class file q's, q is very likely to be a copy of p. Thus, the software birthmark can be used as a simple but powerful signature to distinguish doubtful class files (those which seem to be copies).

Features

Stigmata support the extracting birthmarks from Java class files, and written in Java 5 with ASM.

The main features are:

extraction of the four types of birthmarks directly from Java class files (without source code),
pairwise birthmark comparison of Java class files,
Jar file and War file support,
plug-in architecture for new birthmarks,
analysis of extracted birthmarks (MDS), and
show back extracted birthmark histories

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Links

Project Documentation

Overview

Features

Related Tools

Watermarking Tools

Obfuscator

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