The Research And Application Of Digital Signature Technology

With the development of the information technology,people can get very much information,especially with the development of the internet technology.Nowdays people pay more attention to how to distinguish the reliability,especially relating with economics.For example, how to avoid to afford unnecessary loss when people are dealing with each other. While going to do some official tasks,people maybe hope not to be imitated.Facing these trouble,people often ask how to solve them. In this paper,the main task is to try to solve some problem through using digital signature technology. The contents are included as follows. (1) Discussing the foundation of cryptography.Cryptography is divided into two main parts:symmetric cryptography and public-key encryption scheme,which are discussed and compared respectively in the paper. (2) Analyzing and comparing among several normal signature schemes,including MD5,RSA,DSS and so on. (3) Analyzing digital signature's application in the society.The contents include e-commerce,email and e-politics. (4) Aiming at some techniques such as MD5 and SHA-1 very widely used in digital signature have been cracked, and signature security is facing the danger, a revised digital signature scheme is proposed and implemented.