Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

483e5022e5f2aae226adb4011fdcc44b576a11602331ae40e401d74b4e22e6172ac06b6454eb146f1792a91e4520fa5476b91d1b923682c4197a34a8e7117b3f

Ciphertext (hexencoded):

483e5022e5f2aae226adb4011fdcc44b 576a11602331ae40e401d74b4e22e617 2ac06b6454eb146f1792a91e4520fa54 76b91d1b923682c4197a34a8e7117b3f

Plaintext (hexencoded):

483e5022e5f2aae226adb4011fdcc44b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

H>P"\xe5\xf2\xaa\xe2&\xad\xb4\x01\x1f\xdc\xc4K {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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