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数据安全及加密
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<a href="." >数据安全及加密</a>
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<h1 id="数据安全及加密">数据安全及加密</h1>
<h2 id="1对称加密和非对称加密的区别？">1.对称加密和非对称加密的区别？</h2>
<ul>
<li><p>1、对称加密又称公开密钥加密，加密和解密都会用到同一个密钥，如果密钥被攻击者获得，此时加密就失去了意义。常见的对称加密算法有DES、3DES、AES、Blowfish、IDEA、RC5、RC6。</p>
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<li><p>2、非对称加密又称共享密钥加密，使用一对非对称的密钥，一把叫做私有密钥，另一把叫做公有密钥；公钥加密只能用私钥来解密，私钥加密只能用公钥来解密。常见的公钥加密算法有：RSA、ElGamal、背包算法、Rabin（RSA的特例）、迪菲－赫尔曼密钥交换协议中的公钥加密算法、椭圆曲线加密算法）。</p>
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<h2 id="2简述-ssl-加密的过程用了哪些加密方法，为何这么作？">2.简述 SSL 加密的过程用了哪些加密方法，为何这么作？</h2>
<p>SSL 加密，在过程中实际使用了 对称加密 和 非对称加密 的结合。主要的考虑是先使用 非对称加密 进行连接，这样做是为了避免中间人攻击秘钥被劫持，但是 非对称加密 的效率比较低。所以一旦建立了安全的连接之后，就可以使用轻量的 对称加密。</p>
<h2 id="3ios的签名机制是怎么样的">3.iOS的签名机制是怎么样的</h2>
<ul>
<li><p>签名机制：</p>
<p> 先将应用内容通过摘要算法，得到摘要</p>
<p> 再用私钥对摘要进行加密得到密文</p>
<p> 将源文本、密文、和私钥对应的公钥一并发布</p>
</li>
<li><p>验证流程：</p>
<p> 查看公钥是否是私钥方的</p>
<p> 然后用公钥对密文进行解密得到摘要</p>
<p> 将APP用同样的摘要算法得到摘要，两个摘要进行比对，如果相等那么一切正常</p>
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