Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

600323d84249f83443dc191970e00197e991c0c30fd7126f6e0e4ae24741c3191c462e4a3874bc5b4097968665b314f13a0e6572cd8e8c039f343c3d37cab745

Ciphertext (hexencoded):

600323d84249f83443dc191970e00197 e991c0c30fd7126f6e0e4ae24741c319 1c462e4a3874bc5b4097968665b314f1 3a0e6572cd8e8c039f343c3d37cab745

Plaintext (hexencoded):

600323d84249f83443dc191970e00197 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

`\x03#\xd8BI\xf84C\xdc\x19\x19p\xe0\x01\x97 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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