My research is centered around the theoretical foundations of cryptography and its connections to other areas of theoretical computer science. I am particularly interested in the nature of hardness that is useful for cryptography, and in identifying useful hard problems. I spend a lot of time trying to come up with new constructions of fundamental cryptographic primitives and studying the connections between them. A concise account of my motivations, past work and approach to research may be found in my (outdated) research statement.