Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

5c8d2989f0f9f2a95b3737442e2afcab375379b2dc10b20bc0d46243ffd759d56f5c1e18f7145a9d56cb0f033b655bcccbef2e84b502f572827eb1d5fd601463

Ciphertext (hexencoded):

5c8d2989f0f9f2a95b3737442e2afcab 375379b2dc10b20bc0d46243ffd759d5 6f5c1e18f7145a9d56cb0f033b655bcc cbef2e84b502f572827eb1d5fd601463

Plaintext (hexencoded):

5c8d2989f0f9f2a95b3737442e2afcab 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\\\x8d)\x89\xf0\xf9\xf2\xa9[77D.*\xfc\xab {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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