RSA算法是目前公认的在理论和实际应用中最为成熟和完善的一种公钥密码体制，它是第一个既能用于数据加密也能用于数字签名的算法，是公钥密码体制的代表。-RSA algorithm is considered as a public-key cryptosystem of the most fully developed and complete in theory and practice application at present. It is the first algorithm for both data encryption and digital signature.