Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

bd70911c6b58c5387accac28303f3b9a8ecbe9fcb61a5aa6b2804c9c694b3e364bd6dcc664d2ba9f1c73416f4b8302426d43487cc7fbfd37a281348bda887f15

Ciphertext (hexencoded):

bd70911c6b58c5387accac28303f3b9a 8ecbe9fcb61a5aa6b2804c9c694b3e36 4bd6dcc664d2ba9f1c73416f4b830242 6d43487cc7fbfd37a281348bda887f15

Plaintext (hexencoded):

bd70911c6b58c5387accac28303f3b9a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbdp\x91\x1ckX\xc58z\xcc\xac(0?;\x9a {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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