Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

93c962969a6c97ecdd6c2da3e04d388af9c4d63c7fc42bca40898a52f6b8216a9a499c9ed2a098245886d2696fb08dad90618cdbe5a9fe648d79aeadafe1e95a

Ciphertext (hexencoded):

93c962969a6c97ecdd6c2da3e04d388a f9c4d63c7fc42bca40898a52f6b8216a 9a499c9ed2a098245886d2696fb08dad 90618cdbe5a9fe648d79aeadafe1e95a

Plaintext (hexencoded):

93c962969a6c97ecdd6c2da3e04d388a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x93\xc9b\x96\x9al\x97\xec\xddl-\xa3\xe0M8\x8a {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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