图文详解：

对称加密 ：加密与解密的算法一样
非对称加密：加密与解密的算法不同

加密算法： 明文 -> encode 加密 -> 密文 -> decode 解密 -> 明文
摘要算法： 加密后得到固定长度的摘要，无法解密恢复

http明文传输，中间途径传输节点都知道传输的什么
https加密传输 明文 -> encode 加密 -> 密文 -> decode 解密 -> 明文

80端口 传输数据
443端口 浏览器和服务器处理协商怎么传输（加密解密）数据

请求443端口 四次握手1、浏览器提交支持加密算法的列表 （hi，在吗）
2、服务器收到请求，下发一个加密算法  （hello，我在）《发送加密算法可能被拦截  篡改》

思考：如何保证加密算法不被拦截篡改？

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网址 http请求80端口
网址https请求443端口
回80端口拿数据
浏览器 公钥
中间网络传输节点
中间网络传输节点
中间网络传输节点
服务器 私钥

注意：公钥加密的数据只能私钥解，反之亦然

服务器端
私钥 -> 对数据进行加密 -> 密文 -> （浏览器）用公钥(公钥如何传输才能不被拦截) -> 可以还原成 -> 原文

浏览器端
公钥（不能被篡改，但是可以看，但中间者可以伪造一堆公私钥进行加密解密在传输）-> 对数据进行加密 -> 密文 -> （服务器）用私钥 -> 可以还原成 -> 原文

公钥如何传输才能不被拦截： 公钥不传输就不会被拦截，用当前服务器私钥生成一个公钥，把公钥拷贝到浏览器端。

加密算法： 算法名称 + 盐（秘钥）

CA（认证服务）不是防止数据被偷窥，而是保证用户访问网站的真实性，可以访问到用户真正想要访问的地址，防调用网站
如何防调用网站：ca.私钥（服务器公钥+域名+公钥的摘要）= 证书
浏览器再去校验证书（明文写谁下发的证书，在CA列表里查找对应的下发者，用对应的ca.公钥进行解析，能解析出来相应的数据则为真的）

HTTPS如何进行安全传输： 浏览器对称加密 -> 服务器非对称加密 -> CA的非对称加密

3、浏览器向80端口发送请求
4、得到 加密算法.decode 解密密文

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