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turbofastcrypto [150|117]

We found the frontend code for a remote encryption service at nc challs.sieberrsec.tech 3477:

import turbofastcrypto # The source code for this module is only available for part 2 of this challenge :)
while 1:
    plaintext = input('> ')
    ciphertext = turbofastcrypto.encrypt(plaintext)
    print('Encrypted: ' + str(ciphertext))

My partner says it operates under the hood with "XOR", whatever that means. I need you to recover the key.

Author: @main

Hints

  • Reset the connection if you're having trouble.

Note

The server files for this challenge are located under the Pwn folder here. The flag for this challenge is IRS{secrets_are_revealed!!}.