Michée Lengronne

The Vigenère cipher is an evolution of the Caesar cipher that introduces the concept of a key.

One of the oldest encryptions in history. It is incorrectly attributed to Caesar and remains very poor.

A bit of mathematics. How to do calculations without leaving a small set of numbers.

Connecting to a service, a system, or a website is a process that’s a bit more complex than one might think.

How can you properly manage what you can do on the service compared to what other users can (or cannot) do on the same service?

Facebook, Google, and others allow you to authenticate on different websites through them. How does it work, and what are the risks?

Two-factor authentication strengthens authentication by adding an extra step. But more specifically, what is it?

Many articles on the web try to explain how to create a good password. Unfortunately, they often contain many misconceptions.

Do you manage a web service, a website, or software and want to implement password management for your user sessions?

I see a bad use in the git world.