Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

89d1958ffc3843cca4ab106384e2b395927883f017360921f450aae29ac7e4c3a2b70efabdc4a5eca092d1fd96cb4fbe9c3e4d47da56c165209c0931ce8bd084

Ciphertext (hexencoded):

89d1958ffc3843cca4ab106384e2b395 927883f017360921f450aae29ac7e4c3 a2b70efabdc4a5eca092d1fd96cb4fbe 9c3e4d47da56c165209c0931ce8bd084

Plaintext (hexencoded):

89d1958ffc3843cca4ab106384e2b395 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x89\xd1\x95\x8f\xfc8C\xcc\xa4\xab\x10c\x84\xe2\xb3\x95 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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