Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

4e0742a0fc86199ebf8f41c011e0f93e9fe63241d4db3493bdb8eb2a952eeb7190f1120ccd4380d64c1088a075ebbaf0d84d2b2f05fa9bb939f071475da6f00a

Ciphertext (hexencoded):

4e0742a0fc86199ebf8f41c011e0f93e 9fe63241d4db3493bdb8eb2a952eeb71 90f1120ccd4380d64c1088a075ebbaf0 d84d2b2f05fa9bb939f071475da6f00a

Plaintext (hexencoded):

4e0742a0fc86199ebf8f41c011e0f93e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

N\x07B\xa0\xfc\x86\x19\x9e\xbf\x8fA\xc0\x11\xe0\xf9> {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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