Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

068cf3461229ad319cf9501dbe708ff6bf4b58e6b9434aafc480f9494367e1ba63b6b5284c6ff0c9a2301bf86efb4366e4cf6e87daaecf097171d21578fd8340

Ciphertext (hexencoded):

068cf3461229ad319cf9501dbe708ff6 bf4b58e6b9434aafc480f9494367e1ba 63b6b5284c6ff0c9a2301bf86efb4366 e4cf6e87daaecf097171d21578fd8340

Plaintext (hexencoded):

068cf3461229ad319cf9501dbe708ff6 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x06\x8c\xf3F\x12)\xad1\x9c\xf9P\x1d\xbep\x8f\xf6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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