By Heather Kelly
|Kids learn how to search for vulnerabilities in mobile games at Def Con 20 in Las Vegas. Courtesy of CNN|
The hacker who goes by the pseudonym CyFi won't share her real name and declines to be photographed without her signature aviator sunglasses.
At the annual Def Con hacking conference here Friday, Gen. Keith Alexander, director of the National Security Agency and head of the U.S. Cyber Command, brought CyFi on stage during his keynote address and called her "the most important person for our future."
CyFi is 11 years old.