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Kilian Petit

Cybersecurity Expert | OSINT/CTI Analyst
Email: kil.petit@protonmail.com
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About me custom-line

Expertise in cybersecurity and digital investigation

Cybersecurity expert with 5 years of operational experience, specialised in OSINT, Cyber Threat Intelligence and vulnerability management. Currently an analyst within a healthcare-sector VOC/CERT, I monitor threats, qualify vulnerabilities and build automated intelligence-gathering tools to make analysis work faster and more reliable.

Outside of work, I'm an active CTF competitor (multiple Top 1, 2, 3 rankings in French-speaking OSINT competitions) and I volunteer with associations that search for missing persons. I love sharing, documenting and passing on what I do — whether through investigations, write-ups or content anyone can understand.

Community involvement

Volunteer with associations searching for missing persons, and an active member of francophone cybersecurity and OSINT communities — daily monitoring, exchanges and collective contributions.

"Dans le Visible"

My daily cybersecurity & OSINT webcomic: 365 episodes, recurring characters and cases inspired by real events, published on LinkedIn and Instagram.

Discover the webcomic

What I do:

Cybersecurity

Threat analysis, detection and prevention to strengthen system and data security.

OSINT

Research and exploitation of public information for digital investigations and strategic intelligence.

Vulgarization

Creating clear, accessible content to raise awareness of cybersecurity issues.

Cyber watch

Constant monitoring of cyber news and emerging threats to anticipate risks and share trends.

Automation & Scripting

Building intelligence-gathering pipelines and data collection/processing tools in Python to automate analysis and reporting.

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LinkedIn posts published

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CTF competitions entered

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years of experience in cybersecurity

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certifications & trainings

Work Experience custom-line

My background

An overview of my past experience, in cybersecurity but also in other digital-related fields.

OSINT / CTI Resume English - PDF OSINT / CTI Resume French - PDF Trainer Resume French - PDF

Vulnerability Management Analyst - Sopra Steria

2026 - Present

Cybersecurity watch within a VOC in an MDR context (healthcare sector), production of security bulletins, development of an automated multi-source pipeline for cybersecurity data collection and processing.

Vulnerability Intelligence Engineer - Thales

2021 - 2024

Drafted and reviewed advisories, managed IoCs (MISP/MITRE ATT&CK), developed internal tools and scripts, performed cyber threat press reviews, and handled certificate management.

Web Developer/Pentester - Espace Technologie

2021

Development of a REST web service (API) in C#. Creation of a program that takes as input a payload and as output an encrypted .exe file (AES FIPS 197) to bypass anti-virus software.

Software license management - Internship

2019

License management, analysis and programming, updating the software security key encryption method.

Biomedical Service - Internship

2017

Maintenance and restoration of medical equipment. Learn about the different machines and the types of operations possible.

Technical Projects & Achievements custom-line

CVEWatch V2 - Automated CVE Pipeline

2025 - 2026

Multi-source collection (NVD, MITRE, CERT-FR, CISA KEV, EPSS, 50+ RSS feeds) with full HTML article parsing, contextual EPSS scoring, SQLite database and prioritised daily Excel report.

Cert Note Generator - Internal GUI Tool

2026

Automated generation of DOCX bulletins, notification emails and a monthly Excel tracker, using a dual-network workflow (personal-device collection, professional-network publication).

Full SI Projects - M.A-DEL / DGSI / Soldev - ESGI

2021 - 2024

Design and deployment of secured IT infrastructures across two sites (AD, Fortinet, Wazuh, PKI, EBIOS, BCP/DRP), including a black-box pentest and incident response/forensics.

FYC - Physical Intrusion - Master's Thesis, ESGI

2023 - 2024

Complete training course on physical intrusion (lockpicking, RFID/NFC, tailgating): written theory, 1h30 of video demonstrations, real-world scenarios and gamification.

Education custom-line

Master's degree in Information Security - ESGI

2022 - 2024

OSCP, Forensics, IAM, DevSecOps, Virtualization, EBIOS RM, Infrastructure, Networking, Wi-Fi, Reverse Engineering, Shellcode, Intrusion Detection, Cryptography...

Bachelor in IT Security - ESGI

2021-2022

CEH, CCNA, Cryptography, Vulnerability detection, C, Docker, Linux, Python, Wi-Fi, Defensive security, Windows Kernel/RAM analysis, Physical intrusion...

Bachelor in CDS - ESEO

2017 - 2021

Programming in several languages, Android development, Web project, Electronics (analog/switching...), Network, BDD...

Integrated preparatory course - ESEO

2016

Mathematics, Physics, Digital, Electronics, English, Chinese, Programming...

Skills custom-line

OSINT & Investigation
  • OSINT
  • SOCMINT
  • GEOINT
  • TECHINT
  • Pivoting
  • OPSEC
  • Sock puppets
  • Counter-OSINT
Cyber Threat Intelligence
  • MISP
  • MITRE ATT&CK
  • STIX/TAXII
  • OpenCTI
  • IoCs
  • TLP/PAP
  • APT tracking
Vulnerability Management & CVE
  • CVSS 3.1
  • EPSS
  • CVE lifecycle
  • Contextual prioritisation
  • RSSI reporting
Dev & Automation
  • Python
  • Scraping/Crawling
  • SQLite
  • PySide6
  • C#
  • Automated pipelines
Security
  • Physical intrusion
  • Linux/Windows hardening
  • Active Directory

Certifications & training custom-line

  • OSIP (OSINT/CTI)
  • CCNAv7
  • CEH (prep.)
  • MOOC ANSSI
  • MOOC OSINT-FR

CTF custom-line

OSINT competition results

All my participations in OSINT CTFs, solo or in a team, since 2025.

Year CTF Team Organiser Result
2026 L'appel de la forĂŞt Osint Special Squad 117 Tacosint Top 5/202
2026 Shutlock CTF Solo DGSI Unranked
2026 Skopein CTF - Report Osint Special Squad 117 EEIE Top 1/145
2026 Search Party CTF Polaris Intelligence Group Tracelabs Top 17/124
2026 Skopein CTF - Challenges Osint Special Squad 117 EEIE Top 1/145
2026 404 CTF Solo DGSE Unranked
2026 Medileak 3 Osint Special Squad 117 Oscar Zulu Top 7/186
2026 Bleuet de France v5 Osint Special Squad 117 AEGE Top 4/220
2025 L'armée de Terre s'est fait hacker Solo French Army Unranked
2025 Mission Vérité CTF #BIG2025 Osint Special Squad 117 HACK'OLYTE Top 3/218
2025 Shutlock CTF Solo DGSI Unranked
2025 Hack'Osint 2 - Final Osint Special Squad 117 HACK'OLYTE Top 2/4
2025 Hack'Osint 2 - Qualifiers Osint Special Squad 117 HACK'OLYTE Top 2/378
2025 Medileak 2 OneForAll (solo) Oscar Zulu Top 17/134 (1st solo)
2025 Bleuet de France v4 OneForAll (solo) AEGE Unranked
About TraceLabs: unlike the other CTFs in this table, TraceLabs' Search Party is not a fictional challenge — it's a real, collective OSINT investigation to help locate actually missing persons. The format, ethics and stakes are therefore different from a typical CTF.

Badges custom-line

Tacosint L'appel de la foret Finisher badge Tacosint CTF - Finisher Top 10 Medileak 3 badge Top 10 - Medileak 3 Mission Verite 3rd place badge Mission Vérité - 3rd Place Hack'Osint CTF 2025 2nd place badge Hack'Osint CTF 2025 - 2nd Place Medileak 2 Finisher badge Medileak 2 - Finisher TraceLabs Search Party CTF Participant badge TraceLabs - Search Party CTF Participant

My work custom-line

Technical experience and personal challenges.

Concrete projects and technical challenges to advance cybersecurity and OSINT.

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CTF OSINT

Github
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CTF OSINT

Github
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CTF OSINT

Github
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Physical intrusion

Github
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ConnectHub Project

Github
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DGSI Project

Github
Dans le Visible

Daily webcomic - 365 episodes

Dans le Visible

Keep in touch custom-line

Let's talk

Whether it's for a project, a collaboration, a question, or just to chat, I'm always open to discussion.

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