Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

2a362b990b75773951a719cd3bab3c4e1b912e16d94868f1da218184048410e8e0bb61168caae8a51434d7aaf7e43dfd18cf79309369d3ccd26a4f9a875f11f4

Ciphertext (hexencoded):

2a362b990b75773951a719cd3bab3c4e 1b912e16d94868f1da218184048410e8 e0bb61168caae8a51434d7aaf7e43dfd 18cf79309369d3ccd26a4f9a875f11f4

Plaintext (hexencoded):

2a362b990b75773951a719cd3bab3c4e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

*6+\x99\x0buw9Q\xa7\x19\xcd;\xab<N {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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