Blog

Create a local apt-mirror for offline usage

In some cases, it is necessary to work on offline machines because of sensitive data for example. To install a Ubuntu version on an offline computer is quite easy. Problems begin when it is needed to install some programs/debian packages for your development. With the default configuration, it is not possible to install anything without an Internet connection.

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Generate ROC curve and compute AUC in Java

It is very common to implement a model to classify elements in different categories. A very important step in classification is the evaluation of the model efficiency.

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MongoDB sharding on a single server

Sharding is a method for distributing data (and load) across multiple machines. In this blog post we show how to test MongoDB sharding by running multiple MongoDB instances on a single Ubuntu 16.04 machine.

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Apache Spark MapReduce with PHP

When it comes to Big Data processing, I'm a huge fan of the Apache Spark project. Spark is a very powerful tool to analyse very large datasets in parallel, and at the same time it provides a nice API that allows to write clean distributed code.

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How does WPA/WPA2 WiFi security work, and how to crack it?

The number of Wi-Fi access points is bigger day after day. Everywhere in the street, it is possible to see a lot of Access Point (AP)

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How to upload your files to Nextcloud "File Drop" using curl

Nextcloud is a great tool for self-hosting your data in the vein of Dropbox. It facilitates exchange of information and files in a team, with the extra benefit of providing a robust monitoring and protection capabilities. There are Nextcloud clients available for Windows, Linux and MacOS, which are easy to install and use. With one click you can upload your files to your personal cloud and share them. But sometimes the need arises to upload files from machines that don't use a Graphical user Interface (for example Ubuntu Server distribution). Luckily there exists a way to still be able to upload your files to Nextcloud using the command line and Curl.

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Publishing your Python project to the PyPI repository

Sometimes we might want to play with python scripts that are usefull for us when ran locally. But othertimes the script you have been playing with starts to be more and more important and involved in different projects. In such cases it is an interessting option to upload the python script to an internet repository so it can easily be accessed by you, your team members or other people that might need the same functionalities your script offers.

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Running GITLAB tests locally with Docker CE

The possibility to test integration on our projects when using Gitlab gives us a powerful testing tool to be sure that the code we submit to the repository will work as intended and wont break anything. The way that Gitlab does Continuous Integration (CI) tests is by using Docker containers that can be deployed at demand to test specific aspects of our project.

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Using LaBrea Tarpit to hinder network scans

When hackers prepare a network attack, they usually start with a network scan to detect running computers and installed software.

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BeMilCIS2019 : Blockchain for dummies

Today we are proud to present a paper at BeMilCIS conference entitled Blockchain for dummies.

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A simple java implementation of Blockchain

Blockchain is currently a very hot research topic. To understand how it works and what it can achieve, here is a simple java implementation.

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Blockchain

These last few years everyone everywhere went crazy about cryptocurrencies and more in particular about Bitcoin. The value of the star cryptocurrency did indeed sky-rocket in December 2017 to 19.783$, a 1824% increase in less than a year [2]. However, even though everybody has probably heard about this digital currency, it's likely that very few understand the fascinating technology behind it called blockchain.

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