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Reverse Engineering challenge and a very very very easy one…

Download the file from:

Password for downloading the file: challenge4

To run the file: java -jar “Challenge 4.jar”

or double click on the .jar in windows.

The goal is to figure out what is the password

Every 3 attempts you will be blocked for 30 seconds…


If you like this challenge, you can try “Rafael Reverse Engineering challenges” at:


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  1. Martin English

    I used zip to extract the classes from Chalenge4.jar, but you still need to know a bit about how the java compiler stores strings ๐Ÿ™‚


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