Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

6d1092fb30cb3b9cf83f57628c275ec7e608eea49135f0299b30e67b6a8319e1fe74154ab9eb6fbdf9bf51b60461aa329963f929878ed695bc620b4245ff7261

Ciphertext (hexencoded):

6d1092fb30cb3b9cf83f57628c275ec7 e608eea49135f0299b30e67b6a8319e1 fe74154ab9eb6fbdf9bf51b60461aa32 9963f929878ed695bc620b4245ff7261

Plaintext (hexencoded):

6d1092fb30cb3b9cf83f57628c275ec7 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

m\x10\x92\xfb0\xcb;\x9c\xf8?Wb\x8c\'^\xc7 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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