Furutsuki https://blog.hatena.ne.jp/Furutsuki/ ふるつき https://furutsuki.hatenablog.com/ [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… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Ffurutsuki.hatenablog.com%2Fentry%2F2019%2F12%2F02%2F145526" title="CTFZone 2019 Quals Writeup - ふるつき" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2019-12-02 14:55:26 rich https://furutsuki.hatenablog.com/entry/2019/12/02/145526 1.0 100%