Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

da9d819142ee7370387acb803b388a7beb62f6a5f086d9d1a6c4a1fc2297b51febf5271a53363ead9f2717f6235f87a6149d5bc9cc121c9cd53c8594d82b83c1

Ciphertext (hexencoded):

da9d819142ee7370387acb803b388a7b eb62f6a5f086d9d1a6c4a1fc2297b51f ebf5271a53363ead9f2717f6235f87a6 149d5bc9cc121c9cd53c8594d82b83c1

Plaintext (hexencoded):

da9d819142ee7370387acb803b388a7b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xda\x9d\x81\x91B\xeesp8z\xcb\x80;8\x8a{ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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