A Tour of Open MongoDB Instances

Earlier last month, a security researcher called Victor Gevers sent out a tweet stating that he had stumbled upon a number of open MongoDB databases hosting what was apparantly logged chats from a number of Chinese applications such as Weixin (WeChat) and QQ:

Around 364 million online profiles and their …

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Discovering Interaction Effects in Ensemble Models
Using Friedman's H-statistic

Throughout the past year or so, both R and Python focused data science practioners have picked up on a paper by Friedman and Popescu from 2008 entitled Predictive Learning Via Rule Ensembles. Interestingly enough, the “meat” of the paper — at least in the context we’ll discuss here — is found …

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An Exploration of Cellular Automata and Graph Based Game Systems: Part 3
Moving to Graphs

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An Exploration of Cellular Automata and Graph Based Game Systems: Part 2
Grid Based Fluid Systems

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Note to Self: Fast Android Screen Capture

Getting a reliable, real-time screen of an Android device is more challenging than one might think, e.g. for the purpose of training a reinforcement learning agent.

This post describes a basic approach:

adb shell screencap -p

Sadly, adb mangles binary output and has a tendency to convert \n to …

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Bypassing Android Cert Pinning Using a Rooted Emulator (AVD)

A while ago I was interested in performing some HTTPS MITM analysis on an Android app, without having to rely on a real device but instead using an Android Virtual Device, or in other words: an emulated device. It turns out that this is surprisingly tricky with a lot of …

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Note to Self: Using Tesseract to Extract Subtitles

Say you have video such as this one on Facebook. Most of these come with hardcoded subtitles, which we’d like to extract (for whatever reason).

Opening the page in Chrome and inspecting the network requests quickly uncovers the media URL:

https://video-bru2-1.xx.fbcdn.net/v/t42.9040-2/10000000_703970666457205_4416008794480312320_n …

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