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The below commands will create new directory Download and run Java Bytecode Editor (JBE) In this example we need to modify two methods of Secure Identity Login Module class: encode() and decode().Note that the original encryption/decryption methods only work with 16-character key.Drop me a comment is something is not clear or you have any question. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness.
More information could be found at https://community. Most computers should have the JRE installed by default.
Hence, I use JD-GUI again to verify correctness of the modified jar file.
If there’s any error in the modified class file, JD-GUI will not able to render the new jar file.
For that reason, I prefer to use a standalone decompiler to quickly browse decompiled classes and identify potential classes/methods.
My favorite tool for this task is JD-GUI (we also need it later on to verify the modified bytecode): As shown in the picture above, browsing to Security Identity Login Module reveals the default secret key used to encrypt string.