The Base Java Security Model: The Original Applet Sandbox in Java

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The Base Java Security Model: The Original Applet Sandbox
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Section 12 -- The Fundamental Tradeoff
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In 1, we pointed out that there is no such thing as 100-percent security. Where security is concerned, there is a fundamental tradeoff between power (functionality) and security. Java attempts to be both powerful and secure. Java is trying to manage complex security issues proactively. Despite such efforts, some flaws in the model still need to be addressed. Functionality and security will always exist in an inverse relationship. Currently, Net users choose functionality over security. Java designers are attempting to increase security without paying too high a price in functionality.
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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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Section 1 -- Who Cares
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Java security is important to a number of distinct sets of people:
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Web users, including one of the authors' 89-year-old grandmother, need to understand the risks of using a Java-enabled browser. Developers of Java code that lives and works on the Internet need to keep security in mind when they are writing programs. System administrators need to think carefully about how mobile code, including Java, impacts the security of the systems they run. Business people need to understand what Java security risks are so they can make informed business decisions based on fact and not fiction.
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As you can see, Java security issues are multifaceted. This book has useful information for all four groups, whose interests overlap in many ways. Java security is a hot topic, but that does not make it an easy one. By itself, computer security is not wellunderstood. Throw Java into the mix and things become even murkier. There is much confusion and misinformation floating around about Java and security. Beware of snake oil, impossible claims, and consultants who pretend to have all the answers. Also be aware that major vendors are just as capable of misinformation as fly-by-night companies. Skepticism, Rene Descartes' 300-year-old philosophical insight, is strangely relevant to computer security at the turn of the millennium. In fact, skepticism turns out to be an excellent strategy. Ask hard questions; you might be surprised by the answers.
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The most pressing security concerns surrounding Java impact millions of people-that is, anyone who browses the Web. Given that there are tens of millions of Netscape Navigator and Microsoft Internet Explorer users, the client security issue is no minor detail.1 It turns out that a majority of the users of these browsers are also Java users, whether they know it or not. Java is built in to Netscape Navigator and Internet Explorer, so if you use either of these products, you are a Java user. 1 Just as all Internet users are taking security risks, all Java users are taking security risks. Because of the way Java works, computer security issues are a fundamental concern. Most Java code is automatically downloaded across the network and runs on your machine. This makes it very important to limit the sorts of things that Web-based Java programs can do. Simply put, a hostile Java program could trash your machine. Because Java is inherently Web-based, it provides crackers with an easy way to implement a Trojan Horse-a program that may seem innocent enough on the surface, but is actually filled with wellarmed Greeks. Also of concern is the problem of computer virus propagation. Fortunately, the creators of Java have made a good effort to protect users from these hazards. For example, writing a Web-based Java virus as an applet would be very hard. (Writing a Microsoft Word macro virus like the concept virus is, by contrast, easy.) Because mobile code security is new, difficult, and complicated, Java's masters have not always been successful at protecting everyone all the time. One goal of this book is to educate Java users about the risks that they incur by surfing the World Wide Web with Java-enabled browsers. This chapter provides a gentle introduction to Java and explains why Java is potentially dangerous.