虽然使用 Cookie 和其他方式来跟踪在线用户已经有很长一段时间了。最近在 2014 年开发了一种新的跟踪机制。这种机制使用HTML 5 Canvas Element来跟踪访问者，称为Canvas Fingerprinting。但是由于隐私是当今最重要的安全方面，因此您需要确保您的浏览器是画布指纹证明。

我们已经讨论过如何在 Firefox 中阻止画布指纹。在这篇文章中，我们详细讨论了Canvas 指纹识别^{(Canvas Fingerprinting)}，并介绍了一个免费的Chrome扩展程序“Canvas Defender”，它可以让您保护设备的指纹。

什么是帆布指纹

Canvas Fingerprinting是一种基于图形硬件记录计算机指纹的技术。这些指纹可以由网站共享，本质上是跟踪您在互联网上的使用情况。这些指纹或数字令牌被广告公司广泛用于为您提供个性化广告并跟踪您的行为。

当您访问启用了画布指纹识别的网站时，会指示您的浏览器绘制隐藏的图形。现在，这个渲染的图形可以包含有关系统类型、操作系统、GPU、图形驱动程序^{(Graphics Driver)}的信息。所有这些细节与其他一些信息相结合，会生成您独特的指纹。虽然唯一性不是很好，但是当它与其他指纹方法结合使用时，可以实现所需的熵和唯一性。

阅读^(Read)：浏览器指纹识别和在线隐私^{(Browser Fingerprinting and Online Privacy)}。

^{(Prevent Canvas Fingerprinting)}在Google Chrome上^{(Google Chrome)}防止 Canvas 指纹识别

使用名为“ Canvas Defender ”的扩展程序可以防止浏览器上的Canvas 指纹识别。^{(Canvas Fingerprinting)}这个扩展的特别之处在于，它不是完全阻止Canvas Fingerprinting，而是隐藏您的原始指纹并用欺骗数据替换它。

要查看此工具的运行情况，您可以访问browserleaks.com/canvas并检查浏览器的当前唯一性和签名。现在安装扩展并点击Canvas Defender图标并单击“生成新噪音^{(Generate New Noise)}”。刷新页面以查看指纹的变化。

建议不时生成新的指纹，以便您的身份始终受到保护。此外，每当网页尝试从Canvas获取您的身份时，该扩展程序都会通知您。这些通知很快就会变得烦人，目前没有禁用它们的选项。

此外，该工具可以在正常模式和隐身模式下工作，并且可以完全保护您免受指纹识别。您甚至可以为希望使用原始指纹正常工作的网站维护一个白名单。此外，您可以设置一个时间间隔，之后指纹将自动更改。它有多种选择，从 5 分钟到一周不等。

Canvas Defender是必不可少的Chrome扩展程序。它可以通过生成虚假签名来默默保护您免受Canvas 指纹识别。^{(Canvas Fingerprinting)}与其他指纹阻止应用程序不同，此扩展程序不会完全阻止您浏览器上的指纹。阻止指纹是网站的另一个标识符，并且您已经安装了一些阻止软件。因此，此扩展程序可以以完全安全的方式隐藏您的身份，而不是阻止。

Block Canvas Fingerprinting in Chrome with Canvas Defender

While Cookіes and other means have been used to track online υsers for quite a time now. A new tracking mechanism was developed recently in 2014. This mechanism uses the HTML 5 Canvas Element to track visitors, and it iѕ called Canvas Fingerprinting. But since privacy is the most important security aspect these days, you need to make sure that your browser is canvas fingerprinting proof.

We’ve already talked of how to block canvas Fingerprinting in Firefox. In this post, we’ve discussed Canvas Fingerprinting in detail and covered a free Chrome extension ‘Canvas Defender’ that lets you protect your device’s fingerprint.

What is Canvas Fingerprinting

Canvas Fingerprinting is a technique that records your computer’s fingerprint based upon on your graphics hardware. These fingerprints can be shared by websites essentially tracking your usage on the internet. These fingerprints or digital tokens are widely used by advertising companies to feed you personalized advertisements and track your behavior.

While you visit a website with canvas fingerprinting enabled, your browser is instructed to draw a hidden graphics. Now this rendered graphics can contain information about the type of your system, OS, GPU, Graphics Driver. All these details combined with some other information generates your unique fingerprint. Although, the uniqueness is not so good, but when it is combined with other fingerprint methods the desired amount of entropy and uniqueness can be achieved.

Read: Browser Fingerprinting and Online Privacy.

Prevent Canvas Fingerprinting on Google Chrome

Using an extension called ‘Canvas Defender’ one can prevent Canvas Fingerprinting on your browser. The thing that is special about this extension is that instead of completely blocking Canvas Fingerprinting it hides your original fingerprint and replaces it with spoof data.

To see this tool in action you can go to, browserleaks.com/canvas and check current uniqueness and signature of your browser. Now install the extension and hit the Canvas Defender icon and click ‘Generate New Noise’. Refresh the page to see the changes in your fingerprint.

It is recommended to generate a new fingerprint from time to time so that your identity is always protected. Also, the extension can notify you whenever a web page tries to get your identity from the Canvas. These notifications can get annoying soon, and there is no option to disable them for now.

Moreover, the tool can work both in normal and incognito mode and can completely guard you against fingerprinting. You can even maintain a whitelist for websites that you want to work normally with your original fingerprint. Also, you can setup a time interval after which the fingerprint will automatically be changed. It has a wide variety of options starting from 5 minutes to a week.

Canvas Defender is a must have Chrome extension. It can silently protect you from Canvas Fingerprinting by generating a false signature. Unlike other fingerprint blocking applications, this extension will not completely block fingerprints on your browser. Blocking fingerprints is another identifier for websites and that you’ve installed some blocking software. So instead of blocking, this extension can hide your identity in a completely safe manner.

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