Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

44189c573910c9be0c434334289943fd5a89ba67fa1c5de99b1ee6102c2078aae9e864e9b448ecb22850908fee1c5f3a11ac07c82509ee2787df192dae858b6f

Ciphertext (hexencoded):

44189c573910c9be0c434334289943fd 5a89ba67fa1c5de99b1ee6102c2078aa e9e864e9b448ecb22850908fee1c5f3a 11ac07c82509ee2787df192dae858b6f

Plaintext (hexencoded):

44189c573910c9be0c434334289943fd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

D\x18\x9cW9\x10\xc9\xbe\x0cCC4(\x99C\xfd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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