We help our customers build, operate, and maintain robust OT infrastructures

We combine experience from consulting critical infrastructure operators, and cutting-edge technology into practical and scalable real-world solutions. We’re committed to make mission-critical cyber-physical infrastructure more reliable, secure, and robust.

That’s what we do for three decades

Who we are

Langner is a hybrid software and consulting firm specialized in cyber security for critical infrastructure, large-scale manufacturing, and defense. We did not just produce printed paper or fancy technical gizmos but results that changed the way cyber security, and national security in a larger sense, is seen.

Our analysis of the Stuxnet malware has triggered global changes in policy and defense. In cyber-physical security, we know what works and what doesn’t by decades of hands-on experience. We have given advice to the White House, the Pentagon, the US Senate, the United Nations, and many others.

We believe that cyber-physical security requires more than just technical point solutions — namely strategy and policy, and the indispensable knowledge of human experts, empowered by strong analytical tools. We believe that a combination of strategic thinking, sound technology, good data and skilled people can and will solve the most pressing cyber-physical security problems, and meet the challenge of building a reliable and safe Industrial Internet of Things.
Ralph Langner


Ralph Langner founded the German branch of the Langner group in 1988, and the US-based Langner Inc. in 2017. Ralph accumulated 25 years of hands-on field experience in the cyber security issues of power plants, water treatment facilities, nuclear facilities, food and beverage plants, automotive factories, steel mills, and many more.

He received worldwide recognition for his swift and comprehensive analysis of the Stuxnet malware and is considered a leading global expert on cyber defense.


“Ralph Langner is the global authority on cyber-physical attacks.” Richard Danzig

Former Secretary of the US Navy, Member of the US Defense Policy Board

“The Langner Group has assembled the world’s top experts in cyber-physical security.” Richard Clarke

Former Special Advisor to the US President on Cyber Security, former Chief Counter-Terrorism Adviser on the National Security Council

“Ralph Langner knows cyber-physical security and its policy implications like nobody else.” Stewart Baker

Former General Counsel of the National Security Agency, Steptoe & Johnson

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