Moxie Marlinspike is a computer security researcher who was the chief technology officer and co-founder of Whisper Systems, which was acquired by Twitter for an undisclosed amount in late 2011. Marlinspike is also a member of the Institute For Disruptive Studies, runs a cloud-based WPA cracking service, manages the GoogleSharing targeted anonymity service, and is the author of the Convergence SSL authenticity system.