Access Control, Authentication, and Public Key Infrastructure: .

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MIKE CHAPPLE, PhD, is teaching professor of information technology at the University of Notre Dame’s Mendoza College of Business.'He previously served as Notre Dame’s Senior Director for IT Service Delivery, where he oversaw the information security function.' In past positions, he served as both a consultant and an active duty Air Force officer. He is a technical editor for Information Security magazine and has written 25 other books, including the Security+ Study Guide, Information Security Illuminated, and the Official CISSP Study Guide. He earned his undergraduate and PhD degrees from Notre Dame in computer science and engineering. He also holds a master’s degree in computer science from the University of Idaho and an MBA from Auburn University.

Bill Ballad has been active in the IT security community since the mid-1990s. He is the co-author and SME for Securing PHP Web Applications (Addison-Wesley Professional, 2008) and wrote the security chapters for PHP & MySQL Web Development All-in-One Desk Reference for Dummies (For Dummies, 2008). Bill is a senior systems engineer working with mission-critical Windows networks.'

Tricia Ballad spent several years as a Web applications developer before becoming a full-time freelance writer and technical editor. 'She has written online courseware on various consumer electronics and computing subjects and has co-authored PHP & MySQL Web Development All-in-One Desk Reference for Dummies (For Dummies, 2008) and Securing PHP Web Applications for Mere Mortals (Addison-Wesley Professional, 2008).

Erin Banks (CISSP) is a technical writer and editor. She has been in the network and security industry for more than 15 years in support, management, and technical sales roles in Fortune 500 and not-for-profit organizations. She has contributed quarterly articles to EMC-Now print magazine, provided technical editing for On Magazine, written monthly and quarterly newsletters for a Fortune 25 company, and has been a writer and contributor to a weekly corporate marketing/technical blog. Erin is an avid runner and lover of technology.