{"author_url":"https://blog.hatena.ne.jp/M5453/","provider_url":"https://hatena.blog","url":"https://m5453.hatenablog.com/entry/2026/02/21/174824","published":"2026-02-21 17:48:24","categories":[],"image_url":null,"type":"rich","description":"\u3053\u306e\u8a18\u4e8b\u306f\u3001Daily AlpacaHack B-SIDE \u30672\u670817\u65e5\u306b\u51fa\u984c\u3055\u308c\u305f \"ECRSA\" \u306e writeup \u3067\u3059\u3002 Question Answer Question \u3053\u306e\u554f\u984c\u306f theoremoon\uff08\u3075\u308b\u3064\u304d\uff09\u3055\u3093\u306e\u4f5c\u554f\u3067\u3059\u3002CakeCTF \u306e\u9803\u304b\u3089 theoremoon \u3055\u3093\u306e\u554f\u984c\u306f\uff08\u89e3\u3051\u306a\u304f\u3066\u3082\uff09\u697d\u3057\u304f\u3001\u4eca\u56de\u3082\u697d\u3057\u307e\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3057\u305f\u3002 Elliptic Curve x RSA = ECRSA \u914d\u5e03\u30d5\u30a1\u30a4\u30eb\u306b\u306f\u4ee5\u4e0b\u306e2\u3064\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002 \u300ctask.sage\u300d import os # secp521r1 patemeter p = 0x01fffffffffffffffff\u2026","provider_name":"Hatena Blog","blog_title":"Learning cyber security by playing and enjoying CTFs","height":"190","version":"1.0","author_name":"M5453","width":"100%","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fm5453.hatenablog.com%2Fentry%2F2026%2F02%2F21%2F174824\" title=\"Daily AlpacaHack B-SIDE &quot;ECRSA&quot; writeup - Learning cyber security by playing and enjoying CTFs\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"Daily AlpacaHack B-SIDE \"ECRSA\" writeup","blog_url":"https://m5453.hatenablog.com/"}