As always, I would like to dedicate this book to a lot of special people who have helped me get where I am.

Special thanks to Fyodor for mentoring me during Google's Summer of Code and giving me the opportunity to join the Nmap project.

A big thanks to the development team: David Fifield, Ron Bowes, Patrik Karlsson, Tom Sellers, Patrick Donelly, Daniel Miller, Brendan Coles, Henri Doreau, Toni Routto, Djalal Harouni, Vlatko Kosturjak, Kris Katterjohn, Martin Holst Swende, Jacek Wielemborek, and Luis Martin, from whom I have learned a lot.

Special thanks to my father, Dr. Paulino Calderón Medina, who is no longer with us but will be greatly missed. Thanks to my mother, Edith, and brothers, Yael and Omar, who have always been supportive and given nothing but love.

A big thanks goes to Martha Moguel, without whom this book would have been better while everything else would have been worse. Thank you for always being there for me. I will always love you.

Special thanks to the rest of the Websec ninjas: Lenin "Alevsk" Huerta, Luis "Sinnet" Colunga, Luis "Kazcinski" Ramirez, Roberto "LightOS" Salgado, and Pedro "Hkm" Joaquin.

A big thanks to my friends from USA, Colombia, Mexico, Cozumel, and Canada. It is impossible to list all of you, but know that I appreciate all your love and support. You are always in my heart.

Greetings to my b33rcon friends: Carlos Ayala, Marcos Schejtman, Luis Castañeda, Diego Bauche, and Alejandro Hernandez.