How can I achieve java byte code encryption (against reverse engineering)

Question

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How to lock compiled Java Classes to prevent decompilation

...ideally combined with licensing? Our product is ported from PHP to Java. With PHP, there was a great code encryption / license tool named IONCube Encoder. It encrypts the PHP source code an allows the execution only if a appropriate license is present.

Is there any equivalent for a Java application (that does not rely on a hardware dongle)?

In this context, "encryption" is really just a form of obfuscation, since the key has to be available in the code you are trying to secure. — President James K. Polk, Feb 03 '10 at 12:49

score 3 · Accepted Answer · answered Feb 03 '10 at 09:28

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Take a look at JET Excelsior. That's what we've been using and it's worked pretty well for us.

answered Feb 03 '10 at 09:28

Hermann Hans

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Oh, good Idea, we used it once a couple of years ago - we will evaluate this. – Zeemee Feb 03 '10 at 10:06

score 2 · Answer 2 · answered Feb 03 '10 at 09:21

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IONCube Encoder works by obfuscating your code, not encrypting it. If you want to get the same effect, there are a number of obfuscation tools for Java, such as

answered Feb 03 '10 at 09:21

David Grant

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Thank you for your reply, but I'm in doubt about what you said about IONCube. It works with a key to encrypt the source code and decrypts it using a PHP-Module an the licence as decryption key. – Zeemee Feb 03 '10 at 09:55

score 2 · Answer 3 · answered Feb 03 '10 at 09:52

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You might also want to have a look at the proguard obfuscator

answered Feb 03 '10 at 09:52

er4z0r

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Thank you but does this achieve byte code encryption? – Zeemee Feb 03 '10 at 10:07

How can I achieve java byte code encryption (against reverse engineering)

3 Answers3