Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d9bb1343c71ee00c561e9e5c230db5b8dd9b37f216bb1b97be86c6a9ba59ea18a7a4da1d159c46b5666851997a7841f4ea29a5b4d9bc2b18742819dbc1d0ef3f

Ciphertext (hexencoded):

d9bb1343c71ee00c561e9e5c230db5b8 dd9b37f216bb1b97be86c6a9ba59ea18 a7a4da1d159c46b5666851997a7841f4 ea29a5b4d9bc2b18742819dbc1d0ef3f

Plaintext (hexencoded):

d9bb1343c71ee00c561e9e5c230db5b8 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd9\xbb\x13C\xc7\x1e\xe0\x0cV\x1e\x9e\\#\r\xb5\xb8 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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