Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

b2d0a92d1d7ab37f2b36ed14dbe934e93a4d6bd09f35f40d169221de0109e2a6fb374f8a46913506b9bf859bed277d5afe7c0073bfb17bffb978d20c355ed786

Ciphertext (hexencoded):

b2d0a92d1d7ab37f2b36ed14dbe934e9 3a4d6bd09f35f40d169221de0109e2a6 fb374f8a46913506b9bf859bed277d5a fe7c0073bfb17bffb978d20c355ed786

Plaintext (hexencoded):

b2d0a92d1d7ab37f2b36ed14dbe934e9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xb2\xd0\xa9-\x1dz\xb3\x7f+6\xed\x14\xdb\xe94\xe9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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