Ian Avrum Goldberg (born March 31, 1973) is a cryptographer and cypherpunk. He is best known for breaking Netscape's implementation of SSL (with David Wagner), and for his role as chief scientist of Radialpoint (formerly Zero Knowledge Systems), a Canadian software company. Goldberg is currently a professor at the David R. Cheriton School of Computer Science, within the University of Waterloo. He was formerly Tor Project board of directors chairman, and is one of the designers of off the record messaging.