Far too many to name (and they know who they are), but special thanks to Tim and Courtney without whom this work would not be possible in its current format; D. Kerry Davies, for being the yardstick by which the rest of are measured; GCHQ, for their helpful suggestions; and last but not least, Gary McGath, one of the most underrated musicians of our age.

Also, thanks to every pen tester, hacker, and security evangelist I've toiled with over the years. You are this book.