Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

38463b24339edd78002f67800a8f914d24fe7ba01320b3a2d8d31978a3a199fd6227fdb1886d870220b097ac2d18d0ee92e798c6ce0f27cdc112115e4c4c675d

Ciphertext (hexencoded):

38463b24339edd78002f67800a8f914d 24fe7ba01320b3a2d8d31978a3a199fd 6227fdb1886d870220b097ac2d18d0ee 92e798c6ce0f27cdc112115e4c4c675d

Plaintext (hexencoded):

38463b24339edd78002f67800a8f914d 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

8F;$3\x9e\xddx\x00/g\x80\n\x8f\x91M {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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