Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

93b5b8aebfc4338502fd43e170357147ab1a24acacf3a20a37b046e1a7bc10fd50bf007b14d727996444110b952492d6179e01f059e4c471fd185d68f454e976

Ciphertext (hexencoded):

93b5b8aebfc4338502fd43e170357147 ab1a24acacf3a20a37b046e1a7bc10fd 50bf007b14d727996444110b952492d6 179e01f059e4c471fd185d68f454e976

Plaintext (hexencoded):

93b5b8aebfc4338502fd43e170357147 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x93\xb5\xb8\xae\xbf\xc43\x85\x02\xfdC\xe1p5qG {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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