Cyber technologies underpin every facet of the economy and are critical for national security. Cyber and cyber-enabled systems are rapidly growing in both complexity and scale, and - despite significant progress - are outpacing the capacity to keep them safe, secure, and resilient to disruptions. Cyber hard problems - unsolved technical and research problems for which progress toward solution would have a significant impact on the practical security of cyber systems - are frequently caused or sustained by human or societal factors and misaligned incentives. These in turn are exacerbated by the continuing tremendous growth in the production and use of cyber technologies and their resulting near ubiquity in societally important systems and institutions.
This report builds off of the Cyber Hard Problem List originally developed for the Department of Homeland Security in 1996. Cyber Hard Problems reviews that original list, then provides an update by identifying and describing current key hard problems for cyber resiliency. This report explores each of the identified problems, and then proposes ways to use the list to enhance community-wide coordination of research and development activities.
National Academies of Sciences, Engineering, and Medicine. 2025. Cyber Hard Problems: Focused Steps Toward a Resilient Digital Future. Washington, DC: The National Academies Press.
Sign in to access your saved publications, downloads, and email
preferences.
Former MyNAP users: You'll need to reset your password on your first
login to MyAcademies. Click "Forgot password" below to receive a reset
link via email. Having trouble?
Visit our FAQ page
to contact support.
Members of the National Academy of Sciences, National Academy of
Engineering, or National Academy of Medicine should log in through their
respective Academy portals.
Register
Register
Thank You
Thank You
Thank you for creating a MyAcademies account!
Enjoy free access to thousands of National Academies' publications, a
10% discount off every purchase, and build your personal library.
Forgot Password
Forgot Password
Enter the email address for your MyAcademies (formerly MyNAP) account to
receive password reset instructions.
Reset Requested
Reset Requested
We sent password reset instructions to
your email
. Follow the link in that email to create a new password. Didn't receive
it? Check your spam folder or
contact us
for assistance.
We sent a verification link to your email. Please check your inbox (and
spam folder) and follow the link to verify your email address. If you
did not receive the email, you can request a new verification link below