Skip to Content
Author's profile photo Former Member

Challenge 4

Reverse Engineering challenge and a very very very easy one…

Download the file from:

https://mdocs.sap.com/mcm/public/v1/open?shr=M-DhjX42IHeMD8uWvh-L4Fj8S5W4QtNtLlOWY8nBN5o

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…

/wp-content/uploads/2015/06/challenge4_730544.png

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

http://portal.rafael.co.il/rechallenge15/Documents/rechallenge15/index.html

Gilad

Assigned tags

      2 Comments
      You must be Logged on to comment or reply to a post.
      Author's profile photo Martin English
      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 🙂

      Author's profile photo Former Member
      Former Member
      Blog Post Author

      To solve this easy challenge you can do the following:

      1. Go to Java decompiler online

      2. Upload the .jar file "challenge4.jar"

      3. Then, you can see all jar content

      1.PNG

      4. Inside the MyFrame.java you could see:

      2.PNG