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In software development, obfuscation is the practice of creating source or machine code that is intentionally difficult for humans or computers to understand. Similar to obfuscation in natural language , code obfuscation may involve using unnecessarily roundabout ways to write statements.
JSFuck can be used to bypass detection of malicious code submitted on websites, e.g. in cross-site scripting (XSS) attacks. [10] Another potential use of JSFuck lies in code obfuscation. An optimized version of JSFuck has been used to encode jQuery, a JavaScript library, into a fully functional version written with just the six characters. [11]
Common JavaScript errors, such as typos and type mismatches, are caught at compile time. The JavaScript that the GWT compiler generates can be tailored to be either unobfuscated (Source-Mapped or Source-Code) and easier to understand or obfuscated and compressed. [19] A number of libraries are available for GWT, by Google and third parties.
Jscrambler is a technology company mainly known for its JavaScript obfuscator and eponymous monitoring framework. The obfuscator makes it harder to reverse engineer a web application's client-side code and tamper with its integrity.
The DOM clobbering vulnerability arises from a naming collision between the JavaScript execution context and HTML elements in the Document Object Model (DOM). When an undefined JavaScript variable is declared in the same context as an HTML element with the same name or id parameter, the browser will assign the HTML element to the undefined ...
The source code of these JavaScript files is typically obfuscated to make it harder to reverse engineer how the detection works. [5] Common techniques include: [12] Minification; String arrays; Control flow flattening; Dead code injection; debugger statements, to prevent use of debuggers like DevTools
The goals of minification are not the same as the goals of obfuscation; the former is often intended to be reversed using a pretty-printer [citation needed] or unminifier. However, to achieve its goals, minification sometimes uses techniques also used by obfuscation; for example, shortening variable names and refactoring the source code.
Only developers who knew which file in the source tree and the encoding scheme used to obfuscate the directory of employee about entries could add their names. [ citation needed ] Many other about: easter eggs existed, including the famous about:mozilla, and other less known ones that showed pictures of the Netscape mascot Mozilla in various ...