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Java Forum / General / January 2007Protect class files from decompilation
I understand that it is relatively easy to decompile Java class files into source code. How can I protect my application from being decompiled? > I understand that it is relatively easy to decompile Java class files into > source code. > > How can I protect my application from being decompiled? You can't. What you can do, however, is use an obfuscator (e.g. ProGuard - google for "java obfuscator" for more) which makes the resulting decompiled code harder to understand/reuse/ripoff. Obfuscation usually reduces the compiled bytecode size too. All >> I understand that it is relatively easy to decompile Java class files >> into source code. [quoted text clipped - 5 lines] > decompiled code harder to understand/reuse/ripoff. Obfuscation usually > reduces the compiled bytecode size too. Sounds good, thanks. >> I understand that it is relatively easy to decompile Java class files into >> source code. >> >> How can I protect my application from being decompiled? > > You can't. What you can do, however, is use an obfuscator ... Or better yet, write code that you don't need to feel ashamed of to show. ;-) scnr. Dave wrote: >>> How can I protect my application from being decompiled? > Or better yet, write code that you don't need to > feel ashamed of to show. ;-) Or write code that performs so awfully that no one would want to decompile it. Seems stupid, but I've seen an awful lot of code in production that seems to follow that philosophy. - Lew > I understand that it is relatively easy to decompile Java class files into > source code. > > How can I protect my application from being decompiled? Forgot to add - one 'defence' is to not give them your class files at all, but present your code as a web application (e.g. using Tomcat + servlets). May not be practical though. Maybe you can encrypt your class file and implement your own classloader > I understand that it is relatively easy to decompile Java class files into > source code. > > How can I protect my application from being decompiled? > Maybe you can encrypt your class file and implement your own classloader > >> I understand that it is relatively easy to decompile Java class files >> into source code. >> >> How can I protect my application from being decompiled? And as the custom classloader has to be be shipped with the encrypted class... Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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