Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

8cf110c9c2e521e2ba6d295d162339be3898caef037ba25bf2e07e1c42f08b9d1f1e9c38c4d60a0320d1cff16c7222c2e992d3be74a16ad6dfa05bd80cfc00a1

Ciphertext (hexencoded):

8cf110c9c2e521e2ba6d295d162339be 3898caef037ba25bf2e07e1c42f08b9d 1f1e9c38c4d60a0320d1cff16c7222c2 e992d3be74a16ad6dfa05bd80cfc00a1

Plaintext (hexencoded):

8cf110c9c2e521e2ba6d295d162339be 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x8c\xf1\x10\xc9\xc2\xe5!\xe2\xbam)]\x16#9\xbe {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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