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prevent decompling java classeses

 
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Hi Guys,

I wanna to prevent anyone to decompile my java classes , is this applicable ? if yes what is the process to make this ?
 
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Ultimately, this isn't possible - a determined attacker will prevail. Some steps you can take to make it harder are listed at http://faq.javaranch.com/java/AppletsFaq#decompilation
 
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This topic comes up quite some times. Did you try searching the forums?
 
S Shehab
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Maneesh Godbole wrote:This topic comes up quite some times. Did you try searching the forums?


I found a tool named "http://sourceforge.net/project/downloading.php?group_id=54750&filename=proguard4.4beta2.zip&a=69739920" it's Obfuscator i dont know if this tool may help me or not anyway i'll try it and see..
 
Maneesh Godbole
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The same tool is also mentioned in the link Ulf provided. It is worth trying out.
 
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I have used proguard. It works well. It took me a couple hours learning how it works and optimizing settings. The basic concept is the scramble and shorten variables names and methods so the code still works, but a human would have a hard time reverse engineering the code without considerable effort. One side benefit is that it compresses the size of your classes.

Proguard is a little slow (maybe all obfuscators are). Recently it quit working on my code. It may be running out of memory.
 
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