Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

b3be309a5df6194378660844044e535f66ba0281ea886bcd33f0fa34c982924117163d27d7f877535594ded3f3d4e80c5e9eb6c20886fa97357c9796de336083

Ciphertext (hexencoded):

b3be309a5df6194378660844044e535f 66ba0281ea886bcd33f0fa34c9829241 17163d27d7f877535594ded3f3d4e80c 5e9eb6c20886fa97357c9796de336083

Plaintext (hexencoded):

b3be309a5df6194378660844044e535f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xb3\xbe0\x9a]\xf6\x19Cxf\x08D\x04NS_ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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