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Lacroix Raphaël (Chepycou)

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

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

"MonitorsFour" by Hack The Box - An "Easy" Windows Box Writeup

12 December 2025·162 words·1 min

Here is a Writeup of the Easy MonitorsFour HTB box.

Composing a soundtrack for a 2D shooter game

30 November 2025·208 words·1 min

Composing a soundtrack for a 2D shooter game

"NanoCorp" by Hack The Box - A "Hard" Linux Box Writeup

10 November 2025·295 words·2 mins

Here is a Writeup of the Hard NanoCorp HTB box.

"Giveback" by Hack The Box - A "Medium" Linux Box Writeup

7 November 2025·269 words·2 mins

Here is a Writeup of the Medium Giveback HTB box.

"Code Part Two" by Hack The Box - An "Easy" Linux Box Writeup

29 October 2025·168 words·1 min

Here is a Writeup of the Easy Code Part Two HTB box.

"Conversor" by Hack The Box - An "Easy" Linux Box Writeup

28 October 2025·168 words·1 min

Here is a Writeup of the Easy Conversor HTB box.

"Signed" by Hack The Box - A "Medium" Windows Box Writeup

16 October 2025·160 words·1 min

Here is a Writeup of the Medium Signed HTB box.

"DarkZero" by Hack The Box - A "Hard" Windows Box Writeup

10 October 2025·271 words·2 mins

Here is a Writeup of the Hard DarkZero HTB box.

"Editor" by Hack The Box - An "Easy" Linux Box Writeup

6 August 2025·140 words·1 min

Here is a Writeup of the Easy Editor HTB box.