{"published":"2019-12-02 14:55:26","author_url":"https://blog.hatena.ne.jp/Furutsuki/","image_url":null,"width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Ffurutsuki.hatenablog.com%2Fentry%2F2019%2F12%2F02%2F145526\" title=\"CTFZone 2019 Quals Writeup - \u3075\u308b\u3064\u304d\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"CTFZone 2019 Quals Writeup","blog_title":"\u3075\u308b\u3064\u304d","height":"190","provider_url":"https://hatena.blog","categories":[],"provider_name":"Hatena Blog","blog_url":"https://furutsuki.hatenablog.com/","author_name":"Furutsuki","type":"rich","description":"[Crypto] Agents AES-OFB encrypted json which may formed : {\"trusted\": 0, \"N\": ..., \"e\": 65537} (@ptr-yudai guessed this) when we turned trused into 1, the server returned RSA-encrypted secrets using N and e in json. Since encryption mode was OFB, once we could guess the json format then it is easy t\u2026","version":"1.0","url":"https://furutsuki.hatenablog.com/entry/2019/12/02/145526"}