Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d33c43ef591d508f90667a59a942714b1b6f16e02a7d8d7f3911879b623a7dcfd10740e06412ee03bf03496dfd3d9d88a0a37e92657510cf0fb54f40995620cd

Ciphertext (hexencoded):

d33c43ef591d508f90667a59a942714b 1b6f16e02a7d8d7f3911879b623a7dcf d10740e06412ee03bf03496dfd3d9d88 a0a37e92657510cf0fb54f40995620cd

Plaintext (hexencoded):

d33c43ef591d508f90667a59a942714b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd3<C\xefY\x1dP\x8f\x90fzY\xa9BqK {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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