Lacroix Raphaël (Chepycou)

A blog about stuff I do

I’m a French computer scientist developing various applications in my free time ranging from definitely useless to somewhat useful. I also do quite a lot of Capture the flag and cybersecurity challenges.

Recent

Reasons to replace WhatsApp with a secure alternative such as Signal

3 February 2026·19 words·1 min

Here is an article detailing the various reasons for using Signal (or another alternative) rather than WhatsApp. The primary purpose of this blog post is to enable me to refer anyone who asks me this question on a daily basis to it.

"Overwatch" by Hack The Box - An "Medium" Windows Box Writeup

1 February 2026·231 words·2 mins

Here is a Writeup of the Medium Overwatch HTB box.

How comes there is already a CVE-2026-21858, 20 days into 2026 ? A story of CVE Number attribution and the joys of decentralization

27 January 2026·581 words·3 mins

This article aims at showcasing how CVE numbers are attributed starting the fact that “high”-numbered CVEs can be seen published even early in the year