Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

cb81237d64d5a23d7c1ca8120f1e58cb9f9e9ed8889a466a7ca8695d451012c04eb82f3d6e49dc6d1c78adfabd8800475410befb3b38c20fc9b10f100fb03657

Ciphertext (hexencoded):

cb81237d64d5a23d7c1ca8120f1e58cb 9f9e9ed8889a466a7ca8695d451012c0 4eb82f3d6e49dc6d1c78adfabd880047 5410befb3b38c20fc9b10f100fb03657

Plaintext (hexencoded):

cb81237d64d5a23d7c1ca8120f1e58cb 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xcb\x81#}d\xd5\xa2=|\x1c\xa8\x12\x0f\x1eX\xcb {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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