Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

7e33a4655c63122e34495ba63fbfaf946fa4be2a3cef11631b061f7ef2202ad3c3bc973ee144a539de7ba63e8080fb60082ab77b2ecdd5309ef12bd6937e581b

Ciphertext (hexencoded):

7e33a4655c63122e34495ba63fbfaf94 6fa4be2a3cef11631b061f7ef2202ad3 c3bc973ee144a539de7ba63e8080fb60 082ab77b2ecdd5309ef12bd6937e581b

Plaintext (hexencoded):

7e33a4655c63122e34495ba63fbfaf94 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

~3\xa4e\\c\x12.4I[\xa6?\xbf\xaf\x94 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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