RSA算法是最著名的公开密码体制。基于大数分解的难度。其公开密钥和私人密钥是一对大素数的函数，从一个公开密钥和密文中恢复出明文的难度等价于分解两个大素数之积。算法过程：首先是设计密钥，然后是对消息加密，最后是对密文解密。-RSA algorithm is the most famous public cryptosystem. Based on the difficulty of large integer. Its public key and private key is a functio