I am a Senior Principal Research Scientist, embedded in Yahoo!'s security engineering division (aka "Paranoids"). Previously, I held research positions at AT&T Labs -- Research, Bell Labs, and the IBM T.J. Watson Research Center; did a postdoc at The Weizmann Institute of Science (Israel), and got my PhD in Computer Science from Penn State. My research interests include theoretical and practical aspects of cryptography and information security. Recently, I was the Program Co-Chair for Crypto 2013 and 2014.