I will have a question for you, dear forum residents. I have a .jar file encrypted with ZKM which I think will work for me. I don't know how to decrypt this, can you help me?
ZKM (Zelix KlassMaster) by default obfuscates code, not encrypts it (exception: strings). Therefore there is no decryption. The names that have been obfuscated are gone unless ZKM forgot some identifier which can be used to reconstruct the original class name (but I don't think that the ZKM authors made such a mistake).– RobertAug 5, 2020 at 11:08
So we can't remove it from this software?– SONIC NIXAug 6, 2020 at 7:46
1I’m voting to close this question because not related to reverse-engineering.– peter ferrieAug 7, 2020 at 22:56
I also vote to close this question. In case the OP wanted to know how to decompile the JAR file, I suggest benf.org/other/cfr with obfuscation mapping files.– ikaeromAug 11, 2020 at 23:38
I don't agree with closing the issue. OP made a grammatical mistake, using "decrypt" instead of "deobfuscate". There clearly exist solutions for this sort of problem and I don't see how this could possibly be justified for closure under the premise of "not related to reverse-engineering" aside from the lack of awareness of the subject matter.– Col-EAug 18, 2020 at 17:43
There are a few open source tools that make removing obfuscation patterns quite easy. Some have explicit support for ZKM. Here are are the two popular ones:
And here is one specifically for android: