Detecting Proxies and VPN's with Latency Measurements

Posted on June 07, 2021 in Security • Tagged with proxy-detection, anti-scraping • 10 min read

VPN's and Proxy Servers can be detected by comparing latencies measured with JavaScript in the browser with the corresponding latency of the TCP/IP handshake on the server.


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Detecting Brightdata's (formerly Luminati Networks) Data Collector as a Bot

Posted on June 05, 2021 in Security • Tagged with proxy-provider, bot-detection, anti-scraping • 10 min read

In this blog article I demonstrate several bullet-proof ways how to detect Brightdata Data Collector as a bot without any doubt.


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Detecting Datacenter and Residential Proxies

Posted on April 24, 2021 in Security • Tagged with Proxy Detection • 7 min read

Detecting proxys can't be that hard? Can it?


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Behavioral Analysis for Bot Detection

Posted on April 11, 2021 in Security • Tagged with Behavioral Analysis, Bot Detection • 4 min read

Behavioral analysis is an interesting approach to detect bots. It surely is not the panacea for bot detection, but it certainly is an useful extension in your bot hunting tool belt.


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TCP/IP Fingerprinting for VPN and Proxy Detection

Posted on March 13, 2021 in Security • Tagged with TCP, IP, fingerprinting, Proxy, VPN • 9 min read

TCP/IP fingerprinting is as old as the Internet itself. But this technique seems to have lost it's relevancy in our modern times. However, with the rise of Proxy and VPN Providers, TCP/IP fingerprinting becomes interesting again from a security perspective.


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Why does this Website know that I am sitting on the Toilet?

Posted on February 05, 2021 in Security • Tagged with JavaScript, deviceorientation, devicemotion • 3 min read

Android mobile devices give to any website device orientation and device motion data. This data is quite sensitive in nature and should not be granted to websites without obtaining explicit user consent.


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