Cipher Gatekeeper

Reverse Engineering 200 pts standard

Challenge Description

A secure authentication system guards access using a custom transformation algorithm. At first glance, it seems like a simple password checker — but nothing is stored in plain form. Brute force won't help you here. Can you reverse the logic and recover the correct password?

Flag Format: HackCTF{}

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The input is not compared directly, something happens before the comparison.

        
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Look closely at how each character is transformed, bitwise operations can reveal secrets.

        
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Reverse the transformation step-by-step instead of guessing the input.

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