Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

bdfad5070cf3eccec1d81948d7e6a1486f19006111f6a1393861d06caffc6d81388d2e80f20a7d5c2361c40e931a84c71388e7a25a889fb0fc489b667667861a

Ciphertext (hexencoded):

bdfad5070cf3eccec1d81948d7e6a148 6f19006111f6a1393861d06caffc6d81 388d2e80f20a7d5c2361c40e931a84c7 1388e7a25a889fb0fc489b667667861a

Plaintext (hexencoded):

bdfad5070cf3eccec1d81948d7e6a148 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbd\xfa\xd5\x07\x0c\xf3\xec\xce\xc1\xd8\x19H\xd7\xe6\xa1H {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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