Implementation And Design Of Secure Email System Based On PKI

Now Email becomes the most used application on internet. People use it to transfer their private letters, companies use it to transfer their business plans and data, governments use it to transfer their document, etc. Email is everywhere! But just like the message on postcard, all the message of email is open and can be gotten while it being tranferd between machines. Everyone who nears by computer can see the email. Moreever, an email can be modified by someone but other people hardly know, somebody with malignity can send an email imitating another person. Because lacking of perfect secure email system, domestic govements are not permitted to use email to transfer message in case it was stealed, which block our country's e-business/e-government affair's popularization and information industry's progress.This paper implements a secure Email System based on PKI which provids Digital Signature and Encryption, called as JIMAOXIN(V 1.00.000),.Base on normal email software's characteristics, JIMAOXIN has the following important characteristics: confidentiality, authentication, message integrity assurance, and non-repudiation of origin. It originates two technics:multi-encrypting to email and integrating management of certification into management of directory inquiries It fully reaches the level of commerce.This paper introduces the basic theory of cryptography and knowledge of PKI&CA and some protocols of Email System, such as SMTP, POP3, MIME and MOSS. It analyses and evaluates some popular secure standards of Email. At last.The paper discusses the design and implementation of JIMAOXIN.JIMAOXIN has three notable characteristics: independent intellectual property, without network secure holes in contrast to products abroad and achieving high cryptographic level. It effectively solves several secure problems in traditional Email System. JIMAOXIN is suitable for domestic users. It has profound significance in guaranteeing our country's communication security of email.