Kevin Milne

Kevin Milne is a Threat Intelligence Manager at NatWest Bank with 30 years in Cyber Security. He joined the fascinating world of mainframes just over 3 years ago and is currently writing a book on Offensive Mainframe Security, whilst running the only publicly available Mainframe Pen Testing course at https://offensivesec.org.

You Can Now Carry a Teaching Mainframe in Your Bag

Aug 27, 2026 | Education, Security, Workforce & Training

For years I have told mainframe security newcomers the same thing: If you want to learn how to attack and defend a system, you need to use that system. Unfortunately, z/OS is not something you spin up on a laptop over lunch or throw into your home lab. Mainframe...

Extending the Security Stack: Red Teaming, Scenarios, Risks, and Reality

Jan 12, 2026 | Operations & Resilience, Regulatory Compliance, Risk Management, Security

Mainframes hold the heart of the most critical business processes in finance, healthcare, and government. Yet many security programmes still draw a neat line around them, treating z/OS as out of scope for red teaming, scenarios, and cyber risk quantification. This...