Ralph Langner

Founder and Director

Ralph Langner is director of Langner Communications, an independent German cyber defense contractor that he founded in 1988, and founder and principal at its US sister company Langner, Inc. In his consulting business, Langner accumulated almost three decades of hands-on field experience in the cyber security issues of power plants, water treatment facilities, nuclear facilities, oil and natural gas plants, food and beverage plants, automotive factories, steel mills, and many more. In recent years, Langner turned his broad knowledge of cyber-physical security into scalable software products that allow asset owners and integrators to step up their security game without having to launch large consulting projects. Benefits range from better OT maintainability to protection against nation-state threat actors.

Langner received worldwide recognition for his comprehensive analysis of the Stuxnet malware and is considered a leading global expert on cyber security. He is a frequent keynote speaker at international conferences on cyber security, national security, and critical infrastructure protection. He had been invited to share his insight by the United Nations, NATO, the U.S. Senate Homeland Security and Governmental Affairs Committee (HSGAC), the U.S. Nuclear Regulatory Commission, the International Atomic Energy Agency (IAEA), the International Council on Large Electric Systems (CIGRE), and the White House.

Langner talked at TED, Harvard, Johns Hopkins APL, DARPA, the Pentagon, and appeared in CBS’ 60 Minutes show. He was featured in the movie documentary Weapons of mass disruption for the DC Internation Spy Museum, in PBS/Nova’s Cyberwar Threat, in the Zero Days documentary, in Wired magazine, in Kim Zetter’s Book Countdown to Zero Days, in David Sanger’s Confront and Conceal, and in The London Sunday Times. The New York Times, The Washington Post, The Jerusalem Post, The Christian Science Monitor, Newsweek, The Economist, Foreign Policy, National Public Radio, CNN, Fox News, Reuters, CIO Magazine, Discover Magazine, Vanity Fair, BBC, The Financial Times have looked to him to provide insight on cyber warfare.


Robust Control System Networks. How to achieve reliable control after Stuxnet. Momentum Publishing, 2011

Bound to Fail: Why Cyber Security Risk Cannot Simply Be “Managed” Away. (Together with Perry Pederson) The Brookings Institution, 2013

The RIPE Framework. A process-driven approach to effective and sustainable industrial control system security. Langner Communications corporate whitepaper, 2013

To Kill a Centrifuge. A Technical Analysis of what Stuxnet’s Developers Tried to Achieve. The Langner Group corporate whitepaper, 2013

Stuxnet’s Secret Twin. Foreign Policy, November 19, 2013
Stuxnet: Dissecting a cyberwarfare weapon. IEEE Security & Privacy Magazine, Vol 9, 2011

Cyber power: An emerging factor in national and international security. Horizons Journal of International Relations and Sustainable Development, Issue 8, 2016

Defending Cyber Dominance. Brookings Institution, 2014

Video recordings of selected talks: https://www.langner.com/resources/

My Sessions

Closing Panel … an S4 Tradition

Main Stage

The Closing Panel always gets high marks from attendees. Ralph Langner and Zach Tudor join Dale Peterson on the Main Stage, and no punches are pulled. What are we not talking about? Where do we need to focus? What did we learn from S4x20? and much more. Immediately after the Closing Panel we invite everyone […]

Panel / Debate Strategy

What To Patch When … Automating and Replacing the CVSS

Main Stage

S4x19 included a session on replacing the CVSS for ICS vulnerabilities. It was agreed by all three panelists that it was fatally flawed. And the replacement system that received the most interest was Art Manion’s proposed Now, Next, Never decision tree. Art and the team at CERT/CC have worked on this approach and are prepared […]

Risk Management Strategy