Data Encryption And Digital Signature Technology Research

The information is more and more important with development of society,so the society regard the security of information as important. Crytography technology is the kernel of the security of infoimation.It's used widely in military, politics, business and financial and so on.Now,more and more people protect privacy with it.First the paper expound some crytography technology.It includes the length and management of the key,the analysis about pattern of algorithm.It discusss the select about cyptography algorithm on usage and the technology of cyptography analysis.Then the paper describes crytography algorithm .It includes symmetric crytography algorithm and public-key crytography algorithm.The symmetric crytography algorithm have DES and IDEA.The public-key crytography algorithm have RSA. Secondly;the paper discuss the technology of digital signature and MD5. Finally, the paper describe a system module about encrypt and digital signature.The system use some crytography technology of description before.