Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9ffd4edcd762c8ac2769d6282a7faf22de360a7b3661ec2fe08e5b54c6dee96163a1e24b0b360f7d4daad84074e2c9a1e01f0c27d6b7d87f4bf2214cad233c5b

Ciphertext (hexencoded):

9ffd4edcd762c8ac2769d6282a7faf22 de360a7b3661ec2fe08e5b54c6dee961 63a1e24b0b360f7d4daad84074e2c9a1 e01f0c27d6b7d87f4bf2214cad233c5b

Plaintext (hexencoded):

9ffd4edcd762c8ac2769d6282a7faf22 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9f\xfdN\xdc\xd7b\xc8\xac\'i\xd6(*\x7f\xaf" {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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