DSA是基于整数有限域离散对数难题的，其安全性与RSA相比差不多。DSA的一个重要特点是两个素数公开，这样，当使用别人的p和q时，即使不知道私钥，你也能确认它们是否是随机产生的，还是作了手脚。RSA算法却作不到。-DSA is based on the integer finite field discrete logarithm problem, almost its safety compared with RSA. DSA is an important characteristic of two prime numbers is open, so, when to use someone else' s p and q, even if it does not know the private key, you can confirm whether they are randomly generated, or made the hands and feet. The RSA algorithm is less.