iv Reviewers Goodheart-Willcox Publisher would like to thank the following teachers and administrators who reviewed selected chapters and contributed valuable input to this edition of Principles of Cybersecurity. Charles W. Brown, Jr. CATE Instructor Central High School Pageland, SC Lisa-Marie Burns Business Education Department Chair Washington High School Fremont Unifi ed School District Fremont, CA Kristin A. Burr Business Teacher Merritt Island High School Merritt Island, FL Norma Johnson Cancel Business Marketing and Career Education Instructor Daleville High School Daleville, AL Jason T. Clark Computer Systems Technology Instructor Appomattox County High School Appomattox, VA Florence Lynn Copeland CTE Instructor Chula Vista High School San Diego, CA Jason Cordes Career and Technology Education Teacher Bryan Independent School District Bryan, TX Susan Crane Business Education Teacher Southern Alamance High School Graham, NC Paula F. Dana Business Education Instructor Darlington High School Darlington, SC Phyllis Bullock Eppes Business Education Teacher Powhatan High School Powhatan, VA Sharon Flanagan Business Education Teacher Sipsey Valley High School Buhl, AL Michael P. Harlen Educator Brookland-Cayce High School Columbia, SC Madison Holloman Business Education Teacher Irmo High School Columbia, SC Sharon Lambert Business/Technology Teacher Dunnellon High School (Marion County Public Schools) Dunnellon, FL Shannon Lynch Career & Technical Education Teacher, Computer Technology Southern Alamance High School Graham, NC Teri H. Mitchell Career Tech Instructor—STEM, Cyber, Computer Science Challenger Middle School Huntsville, AL Renee Monteith Business Teacher Clover High School Clover, SC Stephen Morisani, Jr. Mathematics and Computer Science Instructor Fairhope High School Fairhope, AL Darius Powell Business Education Teacher Sycamore High School Cincinnati, OH Sharon Ray, Ed.S. Business Education and Technology Teacher Holly Pond High School Holly Pond, AL Javier Rios Career and Technical Education Instructor JHF Polytechnic High School Sun Valley, CA Tracy C. Smith Business Teacher–Career and Technical Education Fuquay-Varina High School Fuquay-Varina, NC Jessica Tibbs Business and Information Technology Teacher Prince Edward County Public Schools Farmville, VA Kathy Van Vleet Technology Instructor West Port High School Ocala, FL Melanie Weser Teacher/Network Administrator Peninsula Catholic High School Newport News, VA John Williams CATE Computer Science and IT Instructor Whale Branch Early College High School Seabrook, SC