When the Department of Defense talks about securing AI, the conversation drifts toward complex topics like encryption, Zero Trust, and cyber resilience. But at the heart of security is a very simple question: How do we know who, or what, is allowed in?
As AI systems and Agents begin to play a bigger role in military operations, CAC-like authentication is becoming important for machines as it is for people.
What is a CAC?
A Common Access Card (CAC) is the standard ID card for U.S. military personnel, civilian employees, and contractors. It looks like a credit card, but it holds:
▪️Smart chip – stores encrypted certificates that prove your identity.
▪️PIN (Personal Identification Number) – like a password, but tied to the card.
▪️Two-factor security – you need both the physical card and the PIN to gain access.
Think of the CAC as a digital passport. Without it, you can’t log in to most DoD systems.
