Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

8d6c4896d76d49120996d7226629d810fe775ac3e2fb5d39e3bc40617d9f1dfbdd95516f2b9516632b36938158cefb4e79648ffb3b630e76c73b81f0afbbfa73

Ciphertext (hexencoded):

8d6c4896d76d49120996d7226629d810 fe775ac3e2fb5d39e3bc40617d9f1dfb dd95516f2b9516632b36938158cefb4e 79648ffb3b630e76c73b81f0afbbfa73

Plaintext (hexencoded):

8d6c4896d76d49120996d7226629d810 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x8dlH\x96\xd7mI\x12\t\x96\xd7"f)\xd8\x10 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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