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... Preface -- 1 -- 2 -- 3 -- 4 -- 5 -- 6 -- 7 -- 8 -- 9 -- A -- B -- C -- Refs Front -- Contents -- Help
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Copyright 1999 Gary McGraw and Edward Felten. All rights reserved. Published by John Wiley & Sons, Inc.
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Mobile Code and Security: Why Java Security Is Important
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CHAPTER SECTIONS: 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10
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Section 3 -- The Power of Networking
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Networking has changed the face of computing. We once thought of computers as calculating machines, but now most people rightly view them primarily as communication tools. An Internet connection is as essential a part of today's computer as a disk drive. The move toward a globally networked world has been significantly furthered by Java.
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The Internet: A World of Connections
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Since its birth in the early 1970s as a 12-node network called the ARPANET,3 the Internet has exponentially exploded into a worldwide network that provides a central piece of the planet's information infrastructure. Figure 1.2 shows the growth pattern of the Internet from its humble 12-host beginning through today's some 30-million registered addresses.
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Figure 1.2 Growth of the Internet since its early days as the ARPANET.
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Data is from Network Wizards (www.nw.com). The Internet continues to grow at an astounding rate. Connecting computers together in a network allows computer users to share data, programs, and each others' computational resources. Once a computer is put on a network, it is possible to access a remote machine in order to retrieve data or to use its CPU cycles and other resources. Along with this ability comes concern about security. Computer security specialists worry about issues such as:
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Who is allowed to connect to a particular machine How to determine whether access credentials are being faked Who can access which resources on a shared machine How to protect data (especially in transit) using encryption How and where to collect and store audit trails
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Whenever machines are networked, these concerns must be addressed. The Internet, the world's largest network of machines, has encouraged research into these security issues. Mechanisms now in place go beyond simple password authentication, to firewalls and security checking
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tools such as SATAN, ISS, and Ballista. New ideas in computer security are constantly becoming available on the Net. Security approaches currently in preliminary use include encryption-based authentication, encrypted communications, and intrusion detection based on Artificial Intelligence (AI) [Hughes, 1995; Garfinkel and Spafford, 1996; Ghosh, 1998]. Computer security has recently matured into a substantial commercial enterprise as well. As in any new field, however, there is as much hype as there are barrels of snake oil. If it sounds too good to be true, it probably is. Buyer beware.
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The Web: Making the Internet Enticing
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One of the driving forces behind the exponential growth of the Internet in the last several years has been the introduction of the World Wide Web. In 1992, Tim Berners-Lee, a British researcher at the CERN physics facility in Europe, invented the Web, a new way to use the Internet. His invention introduced hypertext markup language (HTML) and Web browsing to the world. In 1993, Marc Andreessen helped to write the Mosaic Web browser while affiliated with the National Center for Supercomputer Applications (NCSA). He later cofounded the company now known as Netscape Communications. Though it may be hard to believe, the Web is only a few years old. Before the invention of the Web, the Internet was almost exclusively text based. Researchers used it to transfer files to one another and to keep in touch via email. After the Web was invented, it suddenly became possible to see graphical pages sent across the Net by Web servers. These Web pages can include pictures, sound, video, and text, as well as hyperlinks to related pages. A Web browser provides an easy-touse, intuitive interface for "surfing," or traveling around the Web, visiting other people's pages. Figure 1.3 shows how a typical Web page looks when viewed with the Netscape browser.
Figure 1.3 A view of this book's companion Web site (www.securingjava.com) as displayed by Netscape Communicator.
All current Web browsers include the capability of running mobile code automatically. Ease of use is partially responsible for the astonishing numbers of Web users, and perhaps for the sense of safety that most Web users seem to enjoy. In addition, creating Web pages is a relatively simple process. HTML editors like Netscape Navigator Gold and Microsoft FrontPage make the job especially easy. Given one of these editors and a Web server, you have all the pieces you need to create your own Web site. An alternative to using an HTML editor is to write HTML code directly. Either way, this snazzy HTML facade makes the Internet more attractive than ever. As shown in Figure 1.4, the Web has grown just as quickly as the Internet itself. The figure charts a conservative estimate of the number of Web servers on the Net. It is these servers that allow people to make Web pages available to everyone. The figure does not properly reflect the number of Web pages that are out there, which some people number in the hundreds of millions. Keep in mind that a server has the potential to serve hundreds or even thousands of pages for multiple users simultaneously.
Figure 1.4 Growth of the World Wide Web, shown as the number of Web servers, since its introduction in 1993. Data from the Internet Society (www.isoc.org).