Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

6506dd9c2436f79ad4bb10f446cbb4db9f34da40aeeea8ac362b3cbfde11c02394c7b6b8df07fbfd2fba40a3df37e7e61582424a62c5e537847c304182e812c9

Ciphertext (hexencoded):

6506dd9c2436f79ad4bb10f446cbb4db 9f34da40aeeea8ac362b3cbfde11c023 94c7b6b8df07fbfd2fba40a3df37e7e6 1582424a62c5e537847c304182e812c9

Plaintext (hexencoded):

6506dd9c2436f79ad4bb10f446cbb4db 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

e\x06\xdd\x9c$6\xf7\x9a\xd4\xbb\x10\xf4F\xcb\xb4\xdb {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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