Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

86df319f8c1fc3b7bf2020fd25ee26bb1cdb49a2f0c9bc087da7a941c920dfc003a94503e594cad87c970ff5a3a9392318711a6f2da875471665d434bfb0057b

Ciphertext (hexencoded):

86df319f8c1fc3b7bf2020fd25ee26bb 1cdb49a2f0c9bc087da7a941c920dfc0 03a94503e594cad87c970ff5a3a93923 18711a6f2da875471665d434bfb0057b

Plaintext (hexencoded):

86df319f8c1fc3b7bf2020fd25ee26bb 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x86\xdf1\x9f\x8c\x1f\xc3\xb7\xbf \xfd%\xee&\xbb {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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