Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

a032a1056a841a3a7a82b8569f1a2d541dbb346bd626788b719e0e0da65c6d45a963f5d7239001e477913ce1ef4833ea82e9b5a9c8c9858baa668c618a4cb0ff

Ciphertext (hexencoded):

a032a1056a841a3a7a82b8569f1a2d54 1dbb346bd626788b719e0e0da65c6d45 a963f5d7239001e477913ce1ef4833ea 82e9b5a9c8c9858baa668c618a4cb0ff

Plaintext (hexencoded):

a032a1056a841a3a7a82b8569f1a2d54 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa02\xa1\x05j\x84\x1a:z\x82\xb8V\x9f\x1a-T {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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