本文简要综述现代密码学的新成果,提出了密码学研究的若干最新方向。文中论述了两种密码体制的新进展,一种是单密钥密码体制,另一种是双密钥密码体制。 This article briefly reviews the recent achievements of modern cryptography and presents some recent directions in cryptography. This paper discusses the recent progress of two cryptosystems, one is the single-key cryptosystem and the other is the double-key cryptosystem.