Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

85d8d8ac694c35d2d2b19afefeb7d36a555e2e7a30cb2b036fdccc752f336109d81ec535ccb8a8cbb6ec9c93553f3cb4ff36856ee96c5ae01d78103e1e07b0fb

Ciphertext (hexencoded):

85d8d8ac694c35d2d2b19afefeb7d36a 555e2e7a30cb2b036fdccc752f336109 d81ec535ccb8a8cbb6ec9c93553f3cb4 ff36856ee96c5ae01d78103e1e07b0fb

Plaintext (hexencoded):

85d8d8ac694c35d2d2b19afefeb7d36a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x85\xd8\xd8\xaciL5\xd2\xd2\xb1\x9a\xfe\xfe\xb7\xd3j {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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