Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d53e12139adee719192bf5d9fb7d14422b78e5e82e8247aa24bac447ef98f5e1d44f2e87947243b4b2456ce718cfeb98b8e52d151107d216636d053d521eb4fb

Ciphertext (hexencoded):

d53e12139adee719192bf5d9fb7d1442 2b78e5e82e8247aa24bac447ef98f5e1 d44f2e87947243b4b2456ce718cfeb98 b8e52d151107d216636d053d521eb4fb

Plaintext (hexencoded):

d53e12139adee719192bf5d9fb7d1442 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd5>\x12\x13\x9a\xde\xe7\x19\x19+\xf5\xd9\xfb}\x14B {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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