Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

bbc65f9c0218760aae57d3e2494abba686a84e10030883fc028ef60876e6c7a220a71e67c712ab1bb7c64f9ba9f4f0c6e59c30d031d98de6eaeef0832c9b6738

Ciphertext (hexencoded):

bbc65f9c0218760aae57d3e2494abba6 86a84e10030883fc028ef60876e6c7a2 20a71e67c712ab1bb7c64f9ba9f4f0c6 e59c30d031d98de6eaeef0832c9b6738

Plaintext (hexencoded):

bbc65f9c0218760aae57d3e2494abba6 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbb\xc6_\x9c\x02\x18v\n\xaeW\xd3\xe2IJ\xbb\xa6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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