Block cipher challenge

Level: CTR mode

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



Ciphertext (hexencoded), for easy copy-paste

1cf1940bb6cb0697609cd7410d971d74ca3b01787b9c1a7fa1b82816c85ff846d92549e1c123632f9a7cade722f946345c45d0cbfb5c080d1cb65d870f87e8ee

Ciphertext (hexencoded):

1cf1940bb6cb0697609cd7410d971d74 ca3b01787b9c1a7fa1b82816c85ff846 d92549e1c123632f9a7cade722f94634 5c45d0cbfb5c080d1cb65d870f87e8ee

Plaintext (hexencoded):

1cf1940bb6cb0697609cd7410d971d74 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1c\xf1\x94\x0b\xb6\xcb\x06\x97`\x9c\xd7A\r\x97\x1dt {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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