A fascinating history of the cybersecurity industry as well as an up-to-date collection of leading cybersecurity vendors from around the globe In the newly revised 2025 edition of Security Yearbook: A History and Directory of the IT Security Industry, celebrated author and information security expert Richard Stiennon delivers the latest complete desk reference for the entire cybersecurity industry. In the book, you'll find a comprehensive directory of cybersecurity vendors, updated for 2025, complete with headquarters location, category, sub-category, number of employees, and growth trends. The author has also included an insightful and concise history of important and relevant sub-sectors of the cybersecurity industry, including Distributed Denial-of-Service defense, network security, endpoint detection, identity and access management, data security, and governance risk compliance. Case studies and stories of key personalities supplement the history, showcasing the stories of significant characters who had their hands in landscape-altering events in the field. You'll also find: Discussions of substantial IT security failures that had an impact on the industry, and on society as a wholeMajor mergers and acquisitions, company failures and closures, and funding events in the cybersecurity sectorSignificant developments in open-source projects with an impact on cybersecurity practitioners around the world Perfect for security architects, CISOs, freelance cybersecurity professionals, and other technical specialists, Security Yearbook 2025 is also a must-read resource for the managers, executives, and directors responsible for guiding and leading the efforts of technology professionals. New entrants to the field will want to read Security Yearbook 2025 cover-to-cover to understand how we got to where we are today. Students will enjoy Stiennon's breezy style as they learn everything the author has gleaned in his 30-year career.