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Part II: Client-Side JavaScript > JavaScript Security

Chapter 21. JavaScript Security

Because of the wide-open nature of the Internet, security is an important issue. This is particularly true with the introduction of languages such as Java and JavaScript, because they allow executable content to be embedded in otherwise static web pages. Since loading a web page can cause arbitrary code to be executed on your computer, stringent security precautions are required to prevent malicious code from doing any damage to your data or your privacy. This chapter discusses Internet security issues related to JavaScript. Note that this chapter does not cover any of the many other issues involved in web security, such as the authentication and cryptographic technologies used to keep the contents of web documents and HTML forms private while they traverse the Web.


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