Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

ce19711ea710b2b1404524e72f1c610a776a2154ba86280bcebd7247740e32cd8f6735353593517c4bf6b6c12dcdc4fbd26a9104c6841688fc2974463d9d932b

Ciphertext (hexencoded):

ce19711ea710b2b1404524e72f1c610a 776a2154ba86280bcebd7247740e32cd 8f6735353593517c4bf6b6c12dcdc4fb d26a9104c6841688fc2974463d9d932b

Plaintext (hexencoded):

ce19711ea710b2b1404524e72f1c610a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xce\x19q\x1e\xa7\x10\xb2\xb1@E$\xe7/\x1ca\n {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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