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For Renee, the most patient and caring person I know. Thank you for being the heart of our family.

       —MJC

      This book is dedicated to my longtime friend Amanda Hanover, who always combined unlimited curiosity with equally infinite numbers of questions about security topics. Amanda lost her fight with mental health struggles in 2019, but you, our reader, should know that there is support out there. Mental health challenges are a struggle that many in the security community face, and community support exists for those who need it. Visit www.mentalhealthhackers.org to find mental health activities at security conferences in your area, as well as resources and links to other resources. You are not alone.

       And Amanda—here are a thousand more security questions for you. Your friend, David

       —DAS