Eric Butler is a security tinkerer and innovator, who forced Facebook and others to make their sites more secure by inventing Firesheep, an easy-to-use hacking tool that exposed a vulnerability in a common Web security protocol. This year, he put the pressure on phone companies by demonstrating the hackability of SIM cards.

Cybersecurity, Security & Defense, Homeland Security & Terrorism, Software, Software Development, Innovation, Hacking