Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

ccd3a6c59dc7bc692ef6515f42546bac93a11cd7a9241f161d18f00369bcd0f1ecbb21a25b5659129b09c4de02e8496844afc47716dfca63f4aaaf02a41f3f87

Ciphertext (hexencoded):

ccd3a6c59dc7bc692ef6515f42546bac 93a11cd7a9241f161d18f00369bcd0f1 ecbb21a25b5659129b09c4de02e84968 44afc47716dfca63f4aaaf02a41f3f87

Plaintext (hexencoded):

ccd3a6c59dc7bc692ef6515f42546bac 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xcc\xd3\xa6\xc5\x9d\xc7\xbci.\xf6Q_BTk\xac {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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