Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

7ac9e7acd48767ec21d0ef14d5188233ee3386ff7459ad985dd21f43bd5ae85dd5e7a8632484ce95b196f71cf384e3dc5a57c6190b7d6206ed77b4cd54ee129b

Ciphertext (hexencoded):

7ac9e7acd48767ec21d0ef14d5188233 ee3386ff7459ad985dd21f43bd5ae85d d5e7a8632484ce95b196f71cf384e3dc 5a57c6190b7d6206ed77b4cd54ee129b

Plaintext (hexencoded):

7ac9e7acd48767ec21d0ef14d5188233 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

z\xc9\xe7\xac\xd4\x87g\xec!\xd0\xef\x14\xd5\x18\x823 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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