An Inter-Classes Obfuscation Method for Java Program

Software is a valuable form of data, representing significant intellectual property, and reverse engineering of software code by competitors may reveal important technological secrets. This problem becomes more serious when facing with the platform independent language - Java byte code. We introduce an inter-classes software obfuscation technique which extracts the codes of some methods in user-defined classes and embeds them into some other object´s methods in the object pool. Since all objects in the object pool are upcast to their common base type, which object´s method will really execute can only be ascertained at runtime. Thus, drastically obscured the program flow. Combined with some enhanced mechanisms, this technique can even resist to dynamic analysis to a certain extent. Experimental result shows that there is little influence to the execution efficiency.