Block cipher challenge

Level: CTR mode

Sorry, you're not an admin (need is_admin: true)



Ciphertext (hexencoded), for easy copy-paste

578e3472e85e528680c8c56c15446d16f5fa9a0920d7d42d2c122a12cef42c901352aaa0149fcd1d7b23af0dcc6511ae3757fbdaa896a66566bcfda61f418d61

Ciphertext (hexencoded):

578e3472e85e528680c8c56c15446d16 f5fa9a0920d7d42d2c122a12cef42c90 1352aaa0149fcd1d7b23af0dcc6511ae 3757fbdaa896a66566bcfda61f418d61

Plaintext (hexencoded):

578e3472e85e528680c8c56c15446d16 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

W\x8e4r\xe8^R\x86\x80\xc8\xc5l\x15Dm\x16 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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