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1、AbstractThe 21 century is an ages of the information economy, being the computer network technique of representative techniques this ages, will be at very fast speed develop soon in continuously creatively, and will go deep into the peoples work, life and study. Therefore, control this technique and

2、 then seem to be more to deliver the importance. Now I mainly introduce the new technique of a few networks in actuality live of application.keywordsInternet Digital Certificates Digital Wallets Grid Storage 1. ForewordInternet turns 36, still a work in progressThirty-six years after computer scient

3、ists at UCLA linked two bulky computers using a 15-foot gray cable, testing a new way for exchanging data over networks, what would ultimately become the Internet remains a work in progress. University researchers are experimenting with ways to increase its capacity and speed. Programmers are trying

4、 to imbue Web pages with intelligence. And work is underway to re-engineer the network to reduce Spam （junk mail） and security troubles. All the while threats loom: Critics warn that commercial, legal and political pressures could hinder the types of innovations that made the Internet what it is tod

5、ay.Stephen Crocker and Vinton Cerf were among the graduate students who joined UCLA professor Len Klein rock in an engineering lab on Sept. 2, 1969, as bits of meaningless test data flowed silently between the two computers. By January, three other nodes joined the fledgling network. Then came e-mai

6、l a few years later, a core communications protocol called TCP/IP in the late 70s, the domain name system in the 80s and the World Wide Web - now the second most popular application behind e-mail - in 1990. The Internet expanded beyond its initial military and educational domain into businesses and

7、homes around the world. Today, Crocker continues work on the Internet, designing better tools for collaboration. And as security chairman for the Internets key oversight body, he is trying to defend the core addressing system from outside threats.He acknowledges the Internet he helped build is far f

8、rom finished, and changes are in store to meet growing demands for multimedia. Network providers now make only best efforts at delivering data packets, and Crocker said better guarantees are needed to prevent the skips and stutters now common with video. Cerf, now at MCI Inc., said he wished he coul

9、d have designed the Internet with security built-in. Microsoft Corp.Yahoo Inc. and America Online Inc., among others, are currently trying to retrofit the network so e-mail senders can be authenticated - a way to cut down on junk messages sent using spoofed addresses. Many features being developed t

10、oday wouldnt have been possible at birth given the slower computing speeds and narrower Internet pipes, or bandwidth, Cerf said. 2.Digital Certificates Digital certificates are data files used to establish the identity of people and electronic assets on the Internet. They allow for secure, encrypted

11、 online communication and are often used to protect online transactions. Digital certificates are issued by a trusted third party known as a certification authority （CA）. The CA validates the identity of a certificate holder and “signs” the certificate to attest that it hasnt been forged or altered

12、in any way. New Uses For Digital Certificates Digital certificates are now being used to provide security and validation for wireless connections, and hardware manufacturers are one of the latest groups to use them. Not long ago, Version Inc. announced its Cable Modem Authentication Services, which

13、allow hardware manufacturers to embed digital certificates into cable modems to help prevent the pirating of broadband services through device cloning. Using Version software, hardware makers can generate cryptographic keys and corresponding digital certificates those manufacturers or cable service

14、providers can use to automatically identify individual modems. This ast-mileauthentication not only protects the value of existing content and services but also positions cable system operators to bring a broad new range of content, applications and value-added services to market. When a CA digitall

15、y signs a certificate, its owner can use it as an electronic passport to prove his identity. It can be presented to Web sites, networks or individuals that require secure access. Identifying information embedded in the certificate includes the holder s name and e-mail address, the name of the CA, a serial number and any activation or expiration data for the certificate. When the CA verifies a users identity, the certificate uses the holders public encryption key to protect this data. Certificates that a Web server uses to confirm the authenticity of a Web site for a users bro