Inside the Head of Information Security's Mind - Handling a Data Breach
A first-hand account of handling a data breach and the lessons learned along the way.
- General
- Data Breach
- HoIS
David Lionis
Cybersecurity and artificial intelligence
I specialise in securing web applications and AI LLM projects. Drawing on both offensive and defensive experience, I also advise you on your overall security posture, in Luxembourg and across Europe.
Portfolio
What I do
About-
Web and application security
Web and API penetration testing, code reviews and support for development teams towards a secure development lifecycle. I find the weaknesses before attackers do, then help you fix them.
- Pentest web & API
- Code review
- OWASP Top 10
- Secure coding
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AI security
Red teaming of LLM-based applications: prompt injection, guardrail bypass and data leakage. Tool-driven, reproducible testing with concrete recommendations.
- LLM red teaming
- OWASP LLM Top 10
- Garak
- PyRIT
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Cybersecurity advisory and expertise
I help you choose the right security solutions, then deploy and configure them: SIEM, EDR, multi-factor authentication, web filtering and vulnerability management. Operational security, tailored to your environment.
- SIEM
- EDR
- MFA
- Vulnerability management
Latest articles
All articles-
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LLM Red Teaming - Data Privacy in Europe with OpenRouter
Best practices for guaranteeing data privacy in Europe with the OpenRouter platform during a Red Team engagement.
- AI
- LLM
- Privacy
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LLM Red Teaming - A Practical Guide to the PyRIT Framework
A hands-on guide to the Python framework of PyRIT, Microsoft's open-source LLM red teaming tool: installation, configuration and a range of advanced use cases.
- AI
- LLM
- AppSec