{"version":"https://jsonfeed.org/version/1.1","title":"苏迟但到的主页","home_page_url":"https://kexohproject.pages.dev","feed_url":"https://kexohproject.pages.dev/json/","description":"<p>你好，欢迎访问个人主页！</p><p>擅长密码学，安全分析，数字水印等技术。</p><p>你可以联系我通过:findmykexin@gmail.com或者知乎私信。</p><p>我的知乎链接：<a href=\"https://www.zhihu.com/people/su-chi-dan-dao\" rel=\"noopener noreferrer\" target=\"_blank\">苏迟但到 - 知乎 (zhihu.com)</a></p><p>我的github链接：<a href=\"https://github.com/kexinoh\" rel=\"noopener noreferrer\" target=\"_blank\">kexinoh</a></p>","icon":"https://kexohcdn.gptapi.cyou/kexohproject/production/images/channel-2e54d141ee195646ca12a9d16507a908.jpg","favicon":"https://kexohcdn.gptapi.cyou/kexohproject/production/images/favicon-340a2925d02a0386f3b954a032834917.jpg","authors":[{"name":"苏迟但到"}],"language":"zh-cn","items":[{"id":"-THH0QWnV5d","title":"hash函数是均匀分布的吗？","content_html":"<p data-pid=\"2zOduM4t\">好的hash函数只需要尽可能的满足一个条件，就是<b>完全随机</b>。</p><p data-pid=\"K5v6S_it\">例如雪崩效应，抗原像性等等都只是在刻画这一个性质。</p><p data-pid=\"9_BfEQL8\">例如你提的，就不一定需要满足，而是1映射到1,2,3,4,5的概率均为1/5，那么完全不碰撞的概率是 <img src=\"https://www.zhihu.com/equation?tex=%5Cfrac%7B4%7D%7B5%7D%5E5%3D0.32\" alt=\"\\frac{4}{5}^5=0.32\" eeimg=\"1\"/> .</p><p></p><p></p>","content_text":"好的hash函数只需要尽可能的满足一个条件，就是完全随机。\n\n例如雪崩效应，抗原像性等等都只是在刻画这一个性质。\n\n例如你提的，就不一定需要满足，而是1映射到1,2,3,4,5的概率均为1/5，那么完全不碰撞的概率是 \\frac{4}{5}^5=0.32\n[https://www.zhihu.com/equation?tex=%5Cfrac%7B4%7D%7B5%7D%5E5%3D0.32] .\n\n\n\n","date_published":"2021-09-26T08:10:43.000Z","_microfeed":{"web_url":"https://kexohproject.pages.dev/i/hash--THH0QWnV5d/","json_url":"https://kexohproject.pages.dev/i/-THH0QWnV5d/json/","rss_url":"https://kexohproject.pages.dev/i/-THH0QWnV5d/rss/","guid":"-THH0QWnV5d","status":"published","itunes:title":"New Article Title for iTunes","date_published_short":"Sun Sep 26 2021","date_published_ms":1632643843000}}],"_microfeed":{"microfeed_version":"0.1.2","base_url":"https://kexohproject.pages.dev","categories":[{"name":"Education","categories":[{"name":"Language Learning"}]},{"name":"Technology"}],"subscribe_methods":[{"name":"RSS","type":"rss","url":"https://kexohproject.pages.dev/rss/","image":"https://kexohproject.pages.dev/assets/brands/subscribe/rss.png","enabled":true,"editable":false,"id":"4KlfbtkEfzy"},{"name":"JSON","type":"json","url":"https://kexohproject.pages.dev/json/","image":"https://kexohproject.pages.dev/assets/brands/subscribe/json.png","enabled":true,"editable":false,"id":"DVFm7TYiNSq"}],"description_text":"你好，欢迎访问个人主页！\n\n擅长密码学，安全分析，数字水印等技术。\n\n你可以联系我通过:findmykexin@gmail.com或者知乎私信。\n\n我的知乎链接：苏迟但到 - 知乎 (zhihu.com)\n\n我的github链接：kexinoh","copyright":"©2024","itunes:type":"episodic","items_sort_order":"newest_first"}}