Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

bc773c22a9d88ed583f61a17f0fb789a9ee4de1bdbb8196da0e3e4f4adc4d558132b4600a2abf747791f0712b0b87211efc45b254082e25699afe99bdf9347a4

Ciphertext (hexencoded):

bc773c22a9d88ed583f61a17f0fb789a 9ee4de1bdbb8196da0e3e4f4adc4d558 132b4600a2abf747791f0712b0b87211 efc45b254082e25699afe99bdf9347a4

Plaintext (hexencoded):

bc773c22a9d88ed583f61a17f0fb789a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbcw<"\xa9\xd8\x8e\xd5\x83\xf6\x1a\x17\xf0\xfbx\x9a {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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