Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

fe5318be7650ded2643c3051d1e4bfa6fcffe69130679d17ef902c241c7009b6e33b91214a072cc160a13b0f5bf9907cebda62154541e5a807c21ef7549ad0de

Ciphertext (hexencoded):

fe5318be7650ded2643c3051d1e4bfa6 fcffe69130679d17ef902c241c7009b6 e33b91214a072cc160a13b0f5bf9907c ebda62154541e5a807c21ef7549ad0de

Plaintext (hexencoded):

fe5318be7650ded2643c3051d1e4bfa6 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xfeS\x18\xbevP\xde\xd2d<0Q\xd1\xe4\xbf\xa6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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