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HalfFeed The HalfFeed service allows us to encrypt almost any message. The only restriction is that it cannot contain the string “cat flag”: def encrypt ( halffeed ): global nonce P = recv_data ( 'plaintext' ) if b 'cat flag' in P : print ( '[EXCEPTION] Invalid Command "cat flag"' ) exit () C , T = halffeed . encrypt ( nonce . to_bytes ( 16 , byteorder = 'big' ), P ) send_data (…
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