Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

c3cd176a2bbbbebd339c8a23373a48b58d59586bacb4b8eeac98bfda4bca75d43567974d1614442d783f8f30474c57c1e5ba5a1f9a0d2caef9928d16c3fc7cd1

Ciphertext (hexencoded):

c3cd176a2bbbbebd339c8a23373a48b5 8d59586bacb4b8eeac98bfda4bca75d4 3567974d1614442d783f8f30474c57c1 e5ba5a1f9a0d2caef9928d16c3fc7cd1

Plaintext (hexencoded):

c3cd176a2bbbbebd339c8a23373a48b5 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xc3\xcd\x17j+\xbb\xbe\xbd3\x9c\x8a#7:H\xb5 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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