New edition, completely updated for macOS 10.13 High Sierra, released September 17, 2017. The best-selling, easiest, step-by-step, most comprehensive guide to securing your home or business macOS computers. Official workbook for the Practical Paranoia: Security Essentials Workshop, STEM and college cybersecurity courses. Designed for instructor-led and self-study. The entire course is contained within the book. Includes all instructor presentations, hands-on assignments, links to all software, and security checklist.