How to encrypt jar files ? (please recommand tool to secure java class file

Dear All:
After release of our webstart application,I begin to worry about the source code -anti compiling if jars are extracted by un-knowen user.
Is there any tool to secure specified jars of a webstart application (wich is composed of lot jar files,I just only want to secure the "KEY" jar file)
I also heard that obfuscator hurts performance ,My boss does not allow such solution)
Besides,If I have to use obfuscator,Is there any setting in jnlp to noted?
Regards
john from Taiwan.

We're using Klassmaster: http://www.zelix.com/klassmaster/index.html
There are a lot of discussions about de-compiling, encrypting and so on on the web, but enctyption discussions allways end up in a catch-22 case, because you will have to supply the classloader with key to unlock your jar-files....
obfuscation is not perfect either, but it can make it really had to get anything usefull from the de-compiled code. We have not noted any preformance problems with obfuscation, only some reflection issues :-)
There are also some special compilers for java which creates linux / windows executables: http://www.excelsior-usa.com/jet.html but I have not tried this myself...
Message was edited by:
AsbjornAarrestad

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