Ivan Krstić is a Croatian computer security expert who is the former director of security architecture at One Laptop per Child where he designed the Bitfrost security architecture for the XO Laptop.
He is a co-author of The Official Ubuntu Book (ISBN 978-0-13-243594-9).
eWeek magazine declared him one of the top three most influential people in modern computer security of 2008.
http://www.eweek.com/c/a/Security/The-15-Most-Influential-People-in-Secu...
http://en.wikipedia.org/wiki/Ivan_Krsti%C4%87