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Web Application Obfuscation by David Lindsay, Gareth Heyes, Eduardo Alberto Vela Nava, Mario Heiderich

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Chapter 4. Nonalphanumeric JavaScript
Information in this chapter:
• Nonalphanumeric JavaScript
• Use Cases
Abstract:
It is believed that nonalphanumeric JavaScript has its roots in contests such as the Obfuscated C contest and Obfuscated Perl contest. These contests were designed to show how creative programmers could be in hiding normal source code using the general syntax of the Perl language. After providing a brief history of nonalphanumeric JavaScript, this chapter takes an in-depth look at how nonalphanumeric JavaScript code works. In JavaScript, objects usually return a string form of their contents when concatenated with another string. In addition, type coercion can produce number-based strings without specifically using numerical characters. ...

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