Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9ad8f1585b037a9c0ab5b4e24fb6afcd07443981c4d3713116f11ce5aaafa67f15521d8120d498d54d53a19512703bc9de197f930ae8183b15e16a31b4668da5

Ciphertext (hexencoded):

9ad8f1585b037a9c0ab5b4e24fb6afcd 07443981c4d3713116f11ce5aaafa67f 15521d8120d498d54d53a19512703bc9 de197f930ae8183b15e16a31b4668da5

Plaintext (hexencoded):

9ad8f1585b037a9c0ab5b4e24fb6afcd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9a\xd8\xf1X[\x03z\x9c\n\xb5\xb4\xe2O\xb6\xaf\xcd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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