Safe Opener 2

Author: Mubarak Mikail | 100 points

Description

What can you do with this file?

I forgot the key to my safe but this file is supposed to help me with retrieving the lost key.

Can you help me unlock my safe?

Solution

For this challenge we are given a file named SafeOpener.class:

% file SafeOpener.class 
SafeOpener.class: compiled Java class data, version 52.0 (Java 1.8)

This challenge was very similar to the previous, in that I used the strings program first. It's easy to jump ahead of yourself in challenges. Keep it simple until you've covered the basics.

% strings SafeOpener.class 
<init>
Code
LineNumberTable
SafeOpener.java
<a bunch of strings I removed (:>
java/io/InputStreamReader
Enter password for the safe: 
java/lang/StringBuilder
You have  
 attempt(s) left
,picoCTF{SAf3_0p3n3rr_y0u_solv3d_it_3dae8463}

Flag

The flag, as seen above, is picoCTF{SAf3_0p3n3rr_y0u_solv3d_it_3dae8463}