Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

c544ce112fade86af5c75687d943a28ae7303a98fa227758fbd209a6c73ba4f0024fca709d6fbf0d07673378b2b71e4222e4bdb815a55f1644ff9f95ac446e55

Ciphertext (hexencoded):

c544ce112fade86af5c75687d943a28a e7303a98fa227758fbd209a6c73ba4f0 024fca709d6fbf0d07673378b2b71e42 22e4bdb815a55f1644ff9f95ac446e55

Plaintext (hexencoded):

c544ce112fade86af5c75687d943a28a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc5D\xce\x11/\xad\xe8j\xf5\xc7V\x87\xd9C\xa2\x8a {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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