Archive

• 12 Mar 2026 ✍️ Je kunt veerkracht niet aanbesteden NL Over ketenweerbaarheid, gedeelde risico's en de illusie dat een contract de klus klaart
• 5 Mar 2026 ✍️ Ik heb toch niets te verbergen NL Waarom het de hoogste tijd is om dit niet langer als zwak argument te zien - maar als strategie.
• 26 Feb 2026 ✍️ The bazaar that never sleeps: AI, throwaway software, and the death of 'normal' What happens to security when anybody can spin up software on a Tuesday and delete it by Thursday?
• 5 Feb 2026 📺 The biggest vulnerability in a crisis is silence @ CCRC

  Interview at CCRC on crisis communication and vulnerability.

• 27 Oct 2025 ✍️ Sovereignty - or the illusion of control From sovereignty theatre to real resilience
• 12 Aug 2025 ✍️ ❤️ Failure - Unbreakable security by breaking things "More incidents = better security"
• 8 Jun 2025 ✍️ From Chief Security Officer to Chief Trust Officer Why technology needs human-centred leadership - and how artificial constraints and calm technology can restore trust in our digital world
• 4 Jun 2025 ✍️ The 10 laws of Cyber Reality (Jelle's version) The more control you seek, the less security you achieve.
• 20 Feb 2025 🎤 Shaping CT's Future: AI & Cybersecurity @ Shaping CT's Future

  Panel discussion on the intersection of AI and cybersecurity (panel starts at ~52:00).

• 20 Nov 2024 📝 Why security is not about Prevention, but about building Capacity @ LinkedIn

  Article on LinkedIn about shifting from prevention-focused to capacity-focused security.

• 5 Mar 2024 🎤 Cybersecurity TV over data-uitwisseling binnen en buiten ziekenhuizen NL

  Paneldiscussie over data-uitwisseling in de zorgsector.

• 14 Feb 2024 🎙️ Quality Code, Safer World: Rethinking Security in Software Development @ Beyond Coding Podcast

  Guest appearance on the Beyond Coding Podcast discussing security in software development.

• 1 Jan 2024 📝 Beveiligingswaarschuwingen als digitale buienradar NL @ Microsoft Pulse

  Artikel over hoe beveiligingswaarschuwingen effectiever kunnen worden ingezet.

• 20 Nov 2023 📺 'Gewoon beginnen' is het advies voor veilig werken in de cloud NL @ SnelStart Magazine

  Interview in SnelStart Magazine over veilig werken in de cloud.

• 15 Nov 2023 🎤 Virtuele rondetafel over DORA: Leer van early adopters en de toezichthouder NL @ Eraneos DORA Rondetafel

  Paneldiscussie over de implementatie van DORA.

• 18 Sep 2023 🎤 Wel of geen losgeld betalen wanneer je bent gehackt? NL @ CTAC

  Paneldiscussie over de afweging om al dan niet losgeld te betalen bij een ransomware-aanval.

• 11 Sep 2023 🎤 Voor cybersecurity is de cloud veiliger dan systemen in eigen beheer NL @ CTAC

  Paneldiscussie over cloud security versus on-premise.

• 4 Sep 2023 🎤 Voorkom je cyberaanvallen vooral door technische of menselijke factoren? NL @ CTAC

  Paneldiscussie over de rol van technische versus menselijke factoren in cyberbeveiliging.

• 21 Jun 2023 🎤 Kunstmatige Democratie NL @ Open Dialoog Pakhuis de Zwijger

  Paneldiscussie in Pakhuis de Zwijger over de impact van AI op democratie.

• 2 Mar 2023 🎤 Cloud security NL @ Port Cyber Cafe FERM

  Paneldiscussie over cloud security bij Port Cyber Cafe FERM.

• 1 Mar 2023 🎙️ Oekraïne: schouder-aan-schouder NL @ NCSC Enter Podcast

  Gastoptreden bij de NCSC Enter podcast over de cyberoorlog in Oekraïne.

• 12 Jan 2023 🎤 Cybersecurity TV Nederland Episode 4 NL

  Paneldiscussie over cybersecurity bij Microsoft.

• 1 Jan 2023 🎙️ Mens, machine en security NL @ Cloud Journey Podcast

  Gastoptreden bij de Cloud Journey podcast.

• 1 Dec 2022 🎙️ Zoldersession podcast NL @ Zoldersession Podcast

  Gastoptreden bij de Zoldersession podcast.

• 4 Oct 2022 🎤 The Best Kept Secret NL @ The Best Kept Secret – Insight

  Panel session at Insight's The Best Kept Secret event. Also available as a short event summary.

• 21 Sep 2022 📺 Cybersecurity niet op orde? NL @ New Business Radio

  Radio-interview bij New Business Radio.

• 3 Sep 2022 🎙️ Cyber Chain Resilience podcast NL @ Cyber Chain Resilience Podcast

  Gastoptreden bij de Cyber Chain Resilience podcast.

• 24 Aug 2022 🎤 Bescherm je bedrijfsvoering en creëer Security Awareness NL @ Axians

  Webinar over security awareness bij Axians.

• 21 Jul 2022 🎙️ Verdieping in de 8 Cyber Security basismaatregelen van het NCSC NL @ NCSC

  Verdieping in de 8 basismaatregelen van het NCSC.

• 24 Jun 2022 🎤 Webinar nation state threats NL

  Webinar over dreigingen van statelijke actoren.

• 6 May 2022 🎤 Iedereen is ICT-er: state of cybercrime NL

  Presentatie over de stand van zaken in cybercrime.

• 28 Mar 2022 🎤 Hybrid working in progress NL

  Paneldiscussie over hybride werken en security.

• 1 Feb 2022 🎙️ It's the people, stupid! @ Cyber Security District Podcast

  Guest appearance on the Cyber Security District podcast.

• 13 Dec 2021 🎤 Jaarevenement 2021 Cybersecurity Alliantie NL @ Jaarevenement 2021 Cybersecurity Alliantie

  Presentatie op het jaarevenement van de Cybersecurity Alliantie 2021.

• 23 Jun 2021 🎤 Het Nationale Cybersecurity Debat NL

  Paneldiscussie over de staat van cybersecurity in Nederland.

• 12 May 2021 📺 The rebellious origins of cybersecurity's wittiest, must-read report @ The Record

  Feature on The Record about the origins of the Verizon DBIR.

• 1 Mar 2021 🎤 Trends in cybersecurity bedreigingen en toepassingen NL

  Paneldiscussie bij Dutch IT Channel over trends in cybersecurity.

• 3 Dec 2020 🎤 Digital Safe Cities: securing the infrastructure of tomorrow @ Digital Safe Cities

  Panel discussion on securing digital city infrastructure.

• 21 Jan 2020 📝 The human is not the weakest link – the human is the solution! @ LinkedIn

  Article on LinkedIn about rethinking the role of humans in cybersecurity.

• 3 Oct 2019 🎤 Het is tijd voor een Deltaplan Cyber Security NL @ Het is tijd voor een Deltaplan Cyber Security

  Presentatie samen met Inge Bryan over de noodzaak van een nationaal Deltaplan voor Cyber Security.

• 20 Nov 2018 🎤 Hack your mind @ NCSC One Conference 2018

  Keynote at the NCSC One Conference 2018 on how our minds can be both our greatest vulnerability and our strongest defense in cybersecurity.

• 22 Oct 2018 📺 Wachtwoorden: we moeten ervanaf. Maar hoe? NL @ NOS

  Interview bij NOS over het einde van wachtwoorden.

  Dit interview is ook gebruikt in: Citolab opdrachtblad Gehackt (PDF).

• 12 Mar 2018 📺 De mens is een essentiële schakel in cybersecurity NL @ Dutchcowboys.nl

  Interview bij Dutchcowboys.nl over de rol van de mens in cybersecurity.

• 1 Aug 2017 🎤 We don't need no security! @ SHA 2017

  Talk at Still Hacking Anyway (SHA) 2017 on rethinking how we approach security.

• 30 Mar 2017 🎤 Security is dead @ DevOn Summit 2017

  Talk at DevOn Summit 2017 challenging traditional approaches to security.

• 8 Mar 2017 📺 Hacktalk #11 – Hacksters NL @ Hacktalk

  Paneldiscussie over vrouwen in cybersecurity tijdens Hacktalk #11 op Internationale Vrouwendag. Tijdens het evenement reikte Petra Oldengarm het Roze Slot uit aan Deloitte.

• 15 Jan 2017 📺 Wat zijn de trucs van Russische hackers? NL @ NRC

  Column in NRC over de methoden van Russische hackers. Also available via archive.ph mirror.

• 1 Oct 2016 🎤 Security Through Design @ BruCON 0x08

  Talk at BruCON 0x08 on designing security that works for people, not against them.

• 29 Sep 2016 📝 Can a hacker be a builder instead of a breaker? @ LinkedIn

  Article on LinkedIn exploring the constructive potential of the hacker mindset.

• 1 Sep 2016 📝 Security through design – reading list @ Security Placebo

  Curated reading list on security through design principles.

• 15 Aug 2016 📺 Stop Blaming Users. Make Security User-Friendly. @ Dark Reading

  Interview with Dark Reading on why blaming users for security failures misses the point.

• 12 Aug 2016 📺 Maybe Security Isn't Just a 'Human Stupidity' Problem @ SDxCentral

  Coverage of Black Hat USA 2016 talk on SDxCentral.

• 10 Aug 2016 🎤 Security Through Design – Making Security Better By Designing for People @ Black Hat USA 2016

  Talk at Black Hat USA 2016 on applying design thinking to cybersecurity, making security work with human behaviour rather than against it.

• 22 Aug 2015 📺 Strijd banken tegen phishing werpt vruchten af NL @ RTL Nieuws

  Nieuwsitem bij RTL Nieuws over de strijd tegen phishing.

• 9 Sep 2011 📺 Datensicherheit für Banken – Risiken erkennen und minimieren DE @ Security Insider

  Article in Security Insider (German) on data security for banks.

• 4 Sep 2011 📺 Spookie just stole your password @ Times of India

  Feature in Times of India on password security.

• 1 Apr 2009 📝 Verizon Data Breach Investigations Report (DBIR) @ Verizon

  Co-author of the first editions of Verizon's Data Breach Investigations Report — specifically the editions of 2009, 2010, 2011 and 2012.

  The DBIR is now one of the most widely cited annual publications in cybersecurity. For some background on how the report series started, read The rebellious origins of cybersecurity's wittiest, must-read report on The Record.