db.js — In-Memory Key-Value Database with Persistent File Storage

Posted on May 29, 2022 in Open Source • Tagged with db.js, in-memory database, key-value storage, JSON file persistance • 5 min read

Instead of using one of the many battle proofed and reliable database solutions out there, I rather created my own solution. In this quick blog post, I am announcing the release of db.js - A in-memory database with persistant file storage.


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How to find out if an IP address belongs to a Hosting / Cloud Provider?

Posted on March 09, 2022 in Security • Tagged with API, Datacenter, Hosting, Cloud-Provider, IP API, Bot-Detection, VPN-Detection, IP-Intelligence, IP-Lookup • 8 min read

It is not entirely trivial to find out if an IP address belongs to a datacenter / cloud provider. In this blog article, I try to find an algorithm that outputs with high confidence if an IPv4 / Ipv6 address belongs to a hosting provider or not.


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Fingerprinting TLS - Core differences between TLS 1.2 and TLS 1.3

Posted on January 18, 2022 in Security • Tagged with TLS Fingerprinting, TLS 1.2, TLS 1.3 • 16 min read

In this blog post, I highlight the core differences between TLS 1.2 and TLS 1.3 and investigate how we can use several properties of the protocol to obtain fingerprinting entropy from TLS clients.


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On High-Precision JavaScript Timers

Posted on December 18, 2021 in Security • Tagged with spectre, meltdown, cache-attacks, high-precision-timing, JavaScript • 10 min read

I in this blog post, I am investigating the current state of high precision JavaScript timers. High precision timing techniques were mostly used to launch CPU-level cache attacks such as Spectre and Meltdown from the browser. I am interested in other use cases though...


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Is this a valid method to detect Proxies?

Posted on November 26, 2021 in Security • Tagged with proxy, proxy-detection, bot-detection, proxy-provider, anti-scraping • 8 min read

I (maybe) found another method to detect browsers that route their traffic through SOCKS/HTTP proxies. What do you think? Is this a valid method to detect Proxies? I need your help!


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So you want to Scrape like the Big Boys? 🚀

Posted on November 03, 2021 in Security • Tagged with scraping, industrial level scraping, big boys • 7 min read

What it really takes to scrape without getting detected.


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