Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

59bd7cf298dcc25e6ff10306ed9f25fdbcd3065e3240545b3159aa0152f8ff91f7102dbce9aca90f97aa0ad33c99e2fb4a620802c63b9adf267e82caf9eb0dc0

Ciphertext (hexencoded):

59bd7cf298dcc25e6ff10306ed9f25fd bcd3065e3240545b3159aa0152f8ff91 f7102dbce9aca90f97aa0ad33c99e2fb 4a620802c63b9adf267e82caf9eb0dc0

Plaintext (hexencoded):

59bd7cf298dcc25e6ff10306ed9f25fd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

Y\xbd|\xf2\x98\xdc\xc2^o\xf1\x03\x06\xed\x9f%\xfd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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