Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

111b3baa4f27a35e95e4a3809a7b34daaa281226bbb39d91c5808e67e804bdde850b4d4f1cacca60fbe260ef1274c60fb42515b22bfac1c43a26db510e50b45d

Ciphertext (hexencoded):

111b3baa4f27a35e95e4a3809a7b34da aa281226bbb39d91c5808e67e804bdde 850b4d4f1cacca60fbe260ef1274c60f b42515b22bfac1c43a26db510e50b45d

Plaintext (hexencoded):

111b3baa4f27a35e95e4a3809a7b34da 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x11\x1b;\xaaO\'\xa3^\x95\xe4\xa3\x80\x9a{4\xda {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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