Fake Encryption

Cryptography 200 pts standard

A script claims to encrypt data securely.

Flag format: HackCTF{...}

        
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Hints:

Hint 1: Read the return statement carefully. What is the function actually sending back?

Hint 3: Python's [::-1] syntax is a common trick. Google what it does to a string!

Hint 3: If the flag is ABC, the output is CBA. Is that really encryption?