I am a professor in the Department of Computer Science at the University of California, Davis, USA. I have also been a visiting professor at Chiang Mai University (TH), Chulalongkorn University (TH), ENS Paris (FR), ETH Zürich (CH), The Isaac Newton Institute (UK), and Mae Fah Luang University (TH). My research is in cryptography. I did my Ph.D. at MIT’s Theory of Computation group (1991) (graduating under S. Micali), worked at IBM as a security architect, then came to UCD (1994), where I’ve spent most of the last 20+ years. My research has focused on obtaining provably-good solutions to protocol problems of genuine utility. I am also interested in social and ethical issues connected to technology. I am embarassed to work at a campus whose Chancellor is known for ethical indiscretions, including the pepper spray incident, her moonlighting for the the DeVry Group and John Wiley & Sons and King Abdulaziz University of Saudi Arabi, and, going further back, the University of Illinois clout scandal. The UC system itself is headed by a former spy chief.