Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

04db5efd63e874fc6d451152e1b83431e9cf170da812b05b9c73d94cc2932003ced0de492a89ca7c4f9bbf65e2a7ce25e2ab14f08ec646e76568c7600d008b65

Ciphertext (hexencoded):

04db5efd63e874fc6d451152e1b83431 e9cf170da812b05b9c73d94cc2932003 ced0de492a89ca7c4f9bbf65e2a7ce25 e2ab14f08ec646e76568c7600d008b65

Plaintext (hexencoded):

04db5efd63e874fc6d451152e1b83431 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x04\xdb^\xfdc\xe8t\xfcmE\x11R\xe1\xb841 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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