Publications

Deep-dive into the deployment of an on-premise low-privileged LLM server

20/03/2026 In 1826, children fantasized riding horses in the Wild West. In 1926, it was outrunning the law as a moonshiner. In 2026, managing distributed inference servers without leaking all the company data is surely a universal dream among the new generation. This article rewinds our journey deploying an on-premise LLM server, with a critical eye on the underlying stack security.

Creating a "Two-Face" Rust binary on Linux

28/10/2025 In this article we will describe a technique to easily create a "Two-Face" Rust binary on Linux: an executable file that runs a harmless program most of the time, but will run a different, hidden code if deployed on a specific target host. This approach, which allows binding a binary to its environment, can be useful for a targeted malware payload or, more commonly, in a license protection mechanism. We will also detail how to make the "hidden" binary more difficult to inspect in memory.

Exploring GrapheneOS secure allocator: Hardened Malloc

22/09/2025 GrapheneOS is a mobile operating system based on Android and focusing on privacy and security. To enhance further the security of their product, GrapheneOS developers introduced a new libc allocator : hardened malloc. This allocator has a security-focused design in mind to protect processes against common memory corruption vulnerabilities. This article will explain in details its internal architecture and how security mitigation are implemented from a security researcher point of view.

Defend against vampires with 10 gbps network encryption

13/09/2024 Discover how attackers can sniff your data on network cables and how you can defend against it, by encrypting on-the-fly all your ethernet traffic with very good performance. Keywords : wireguard, vxlan, tapping, fiber optics, lan2lan, macsec

Battle of the parsers: PEG vs combinators

25/07/2024 In this article we will compare two parsing strategies : PEG based and combinators based, from a developer's perspective, to parse Strace output for the SHH (Systemd Hardening Helper) Rust project.

iOS: a journey in the USB networking stack

30/04/2024 In this article, we give a small journey inside the implementation of networking interfaces exposed by iOS when connected via USB. These are used for sharing a computer's connection with iPhone (tethering), sharing an iPhone's connection with a computer (reverse tethering) and since the latest versions of iOS, USB networking even carries RemoteXPC packets which seems to be the future common ground for all Apple based cross-device communications.

Writing a decent win32 keylogger [3/3]

21/12/2023 In this series of articles, we talk about the ins and out of how to build a keylogger for Windows that is able to support all keyboard layouts and reconstruct Unicode characters correctly regardless of the language (excluding those using input method editors). In the first part, after a brief introduction introducing the concepts of scan codes, virtual keys, characters and glyphs, we describe three different ways to capture keystrokes (GetKeyState, SetWindowsHookEx, GetRawInputData) and the differences between those techniques. In t...

Writing a decent win32 keylogger [2/3]

21/12/2023 In this series of articles, we talk about the ins and out of how to build a keylogger for Windows that is able to support all keyboard layouts and reconstruct Unicode characters correctly regardless of the language (excluding those using input method editors). In the first part, after a brief introduction introducing the concepts of scan codes, virtual keys, characters and glyphs, we describe three different ways to capture keystrokes (GetKeyState, SetWindowsHookEx, GetRawInputData) and the differences between those techniques. In t...

Writing a decent win32 keylogger [1/3]

21/12/2023 In this series of articles, we talk about the ins and out of how to build a keylogger for Windows that is able to support all keyboard layouts and reconstruct Unicode characters correctly regardless of the language (excluding those using input method editors). In the first part, after a brief introduction introducing the concepts of scan codes, virtual keys, characters and glyphs, we describe three different ways to capture keystrokes (GetKeyState, SetWindowsHookEx, GetRawInputData) and the differences between those techniques. In t...

systemd hardening made easy with SHH

07/11/2023 Introducing SHH, Systemd Hardening Helper, a tool written in Rust to automatically build a set of hardening options for a service using runtime profiling.