Anonymity in Human Emulator Studio. Browser Fingerprints.

Browser Fingerprint.

Earlier in articles about anonymity, we already touched on the so-called browser fingerprints. What kind of prints are these? In fact, this is a means to determine the user based on the various parameters of his system, the software installed in it, as well as information about the hardware of the computer itself. All this is determined using various JS libraries, and after processing, it is converted to a fingerprint string, after which this string is converted to a 32-bit number and this will be your identifier. With this number can be determine the repeated visit to the site or track all your actions on this site.

So in the article Anonymity in Human Emulator Studio. Managing embedded browser information we have already talked about the parameters that affect the browser fingerprint. This is the userAgent string (navigator.userAgent), as well as the parameters of the navigator object appVersion, appName, appCodeName, language (s), platform, product, productsub, information about plugins and equipment, screen size, screen color depth.

In the article Anonymity in Human Emulator Studio. The location is Timezone, Internationalization, navigator.language.

In this article, we’ll look at other parameters that affect your browser fingerprint or, to put it another way, your user identifier.

Сanvas Fingerprint.

This is a special technology with which helps text is drawn on a hidden Canvas element with effects superimposed on it. Then
this image is converted to an array of bytes, and then converted to a base64 string using canvas.toDataULR(). And this line is added to your browser fingerprint.

Moreover, due to the platform dependences of the Canvas API library, with which helps the text drawing is performed, the resulting set of bytes will be unique on almost every computer.

To substitute this parameter in Human Emulator Studio, use the object browser command set_canvas_toDataURL

From version 7.0.43, any number or line is passed as a parameter on the basis of which “noise” is created for an image with text.

php example:

The result of the set_canvas_toDataURL function.

No noise:

Using noise:

WebGL Fingerprint.

WebGL Fingerprint this is a further development of the idea of Сanvas Fingerprint.

WebGL is a JavaScript API for visualisation interactive 3D graphics in any compatible web browser without using plugins. WebGL applications consist of control code written in JavaScript and special effects code executed on the computer’s GPU. WebGL elements can be mixed with other HTML elements and combined with other parts of the page or page background.

Using this API, 3D triangles are drawn on which various effects are superimposed. Then, as well as with Canvas Fingerprint, the resulting image is converted into an array of bytes, which will be different on different computers.

The command set_random_webgl_fingerprint has been added to the object browser. In version 7.0.43, this command has undergone changes and now it does not randomly generate a value, but creates it based on the specified parameters.

Parameters for working with the command:
enable = true – use substitution or not
noiseImage – a number from 1 to 999999 – this is the noise applied to rendering images via WebGl; the larger the number, the greater the noise.
noiseParams – a string of numbers – 50 digits long, where each digit in the string is used to create noise for the WebGl parameters used to create the WebGL Report Hash on the page browserleaks.com/webgl – the parameters themselves on the same page are below: (Max Vertex Attributes, Max Vertex Uniform Vectors, etc.)
unmaskedVendor, unmaskedRenderer, glVersion, shadingLanguageVersion, vendor, renderer are string values that can be viewed in the table at page browserleaks.com/webgl.

php example:

Before using spoofing:

After completing the work of the example, we have:

The command will act until the program is restarted or until you call it in the following form:

WebGL can simply be disabled using the browser enable_gpu_rendering object command.

php example:

Google SwiftShader.

In version 7.0.43, the option Enable Google SwiftShader for rendering is added.

What is Google SwiftShader? This is a special library that is used for high-performance rendering, which provides a graphics API implementation that runs on the CPU. It is used to display advanced 3D graphics regardless of the equipment and graphics drivers used. SwiftShader is used in Chrome to run WebGL on systems without modern GPUs or to work around problems in graphics drivers.

Why it is important for anonymity, enabling or disabling the use of Google SwiftShader in the Human Emulator Studio affects all parameters of browser fingerprint associated with rendering. Including information about the graphics driver, in particular WebGL Unmasked Renderer settings.

When Google SwiftShader is enabled, WebGL information:

With Google SwiftShader disabled:

As we see from the pictures that not just the Unmasked Renderer parameter is changing, but also the resulting lines of WebGL WebGL Report Hash and WebGL Image Hash. The same thing happens with Canvas Fingerprint, it also changes depending on whether Google SwiftShader is enabled or disabled.

This parameter changes only from the program settings and after changing it a mandatory restart of the program is required.

Font fingerprinting.

Font fingerprint(System fonts) is what fonts you have installed on your OS and how they are drawn. Based on the size measurement of HTML text elements, can be build an identifier that can be used to track the same browser over time.

Here are some options for getting your font fingerprint:

JS Fonts(unicode) — are produced by measuring the boundary fields of certain Unicode code points based on the above study.
JS Fonts (classic) — uses a CSS fallback mechanism to compare the prepared font list with common font families.
Flash Fonts — this is the simplest, Flash has a method that simply returns an array of available system fonts.

Based on all the information received, your unique identifiers are created again.

When the browser scale is changed even by 1 unit, the Font fingerprint identifiers also change.

Without zooming:

after executing the php code:

As you can see from the pictures, the definition of fonts using Flash in Human Emulator Studio is disabled by default.

Since version 7.0.43, the command set_random_bounds_fingerprint has been added to the object browser.

The command takes a parameter:

noise = -1 – noise, this is a number from -1 to 999999999. By default, noise is -1, that is, there is no noise.

Without using the command:

An example of using a command in php:

After executing the command:

You can remove the distortion using the command as follows:

ClientRect.

The getClientRects method returns a value that is a collection of DOMRect objects, one for each CSS border field associated with the element.
Depending on other parameters such as resolution, fonts, etc. makes this value unique for each computer, and accordingly, having received this value, you can be identified by it in the future.

There is no substitution for this fingerprint, but it is also affected by changes in browser scale even by 1 unit.

php example:

Without zooming:

After running the example in php:

In any case, at the moment, our development department is looking for a solution to replace ClientRect.

As the functionality associated with the fingerprints of the browser changes or supplements, this article will be supplemented or modified.

AudioContext Fingerprint.

It works similarly to other fingerprints, but instead of the Canvas API, in this case, the AudioContext API library is used, this is the Web Audio API that all modern browsers support. Using the AudioContext API to determine the AudioContext fingerprint does not collect the sound played or recorded by your device, the AudioContext fingerprint is a property of the audio stack of your device and this method of obtaining your identifier is independent of the browser.

To replace this fingerprint in version 7.0.43 to the object browser the command set_random_audio_fingerprint was added.

The command accepts the following parameters:
noiseAudio – sound noise, can be from 1 to 999999.
noiseFrequence – frequency noise, can be from 1 to 99.

Without using the value function on audiofingerprint.openwpm.com:

php command example:

After executing the example:

In order to reset to default, you just need to call the command in the form:

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