Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

cb13a36e24051ea4e1f7dcebf4c499235ab3a4312659605cec09efec6d53d27b81b6ce3ffee477fcbfcb8191c5b821bf160da2b652c6810720251b02744e101a

Ciphertext (hexencoded):

cb13a36e24051ea4e1f7dcebf4c49923 5ab3a4312659605cec09efec6d53d27b 81b6ce3ffee477fcbfcb8191c5b821bf 160da2b652c6810720251b02744e101a

Plaintext (hexencoded):

cb13a36e24051ea4e1f7dcebf4c49923 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xcb\x13\xa3n$\x05\x1e\xa4\xe1\xf7\xdc\xeb\xf4\xc4\x99# {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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