Acknowledgments

"The learning and knowledge that we have, is, at the most, but little compared with that of which we are ignorant."

Plato (427347 B.C.)

The authors would like to extend their thanks to the Prentice Hall publishing team, including Greg Doench, Ralph Moore, Bonnie Granat, and Lara Wysong for their constant help and support in the process of creating this work.

We also thank Judy Lin, Joe Uniejewski, Whitfield Diffie, Li Gong, John Crupi, Danny Malks, Deepak Alur, Radia Perlman, Glenn Brunette, Bill Hamilton, and Shaheen Nasirudheen for their initial feedback and for sharing their best thoughts and advice.

Numerous others furnished us with in-depth reviews of the book and supported us with their invaluable expertise. Without their assistance, this book would not have become a reality. Our gratitude extends to Seth Proctor, Anne Anderson, Tommy Szeto, Dwight Hare, Eve Maler, Sang Shin, Sameer Tyagi, Rafat Alvi, Tejash Shah, Robert Skoczylas, Matthew MacLeod, Bruce Chapman, Tom Duell, Annie Kuo, Reid Williams, Frank Hurley, Jason Miller, Aprameya Puduthonse, Michael Howard, Tao Huang, and Sen Zhang.

We are indebted to our friends at Sun Microsystems, RSA Security, VeriSign, Microsoft, Oracle, Agilent Technologies, JPMorganChase, FortMoon Consulting, AC Technology, Advanced Biometric Controls, and the U. S. Treasury's Pay.Gov project for all their direct and indirect support and encouragement.