Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d9b068e47feebddfe809d5d2e9207e579de4185136977303a3089c08c86c1bb33eb2f28e5fe928056cbb5a6d0cf0beb7fe44db179961374ee948f98154273143

Ciphertext (hexencoded):

d9b068e47feebddfe809d5d2e9207e57 9de4185136977303a3089c08c86c1bb3 3eb2f28e5fe928056cbb5a6d0cf0beb7 fe44db179961374ee948f98154273143

Plaintext (hexencoded):

d9b068e47feebddfe809d5d2e9207e57 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd9\xb0h\xe4\x7f\xee\xbd\xdf\xe8\t\xd5\xd2\xe9 ~W {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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