Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

dad1f41f76a0892eb4be83cf84f0384e6333c12312dfbd4388d263b7ad643079b6e1751ead747d01eef06b22ea3d8db8b21ea0a06ef46e288a7c2bf58a056461

Ciphertext (hexencoded):

dad1f41f76a0892eb4be83cf84f0384e 6333c12312dfbd4388d263b7ad643079 b6e1751ead747d01eef06b22ea3d8db8 b21ea0a06ef46e288a7c2bf58a056461

Plaintext (hexencoded):

dad1f41f76a0892eb4be83cf84f0384e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xda\xd1\xf4\x1fv\xa0\x89.\xb4\xbe\x83\xcf\x84\xf08N {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

{"username": "guest", "is_guest": true}