I am a cryptographer working at NTT, Japan. My main research area is the foundations of cryptography. I am particularly interested in the design and analysis of cryptographic protocols with strong security guarantees (such as non-malleability, concurrent security, and composability).

Before joining NTT, I was a student at Kyoto University. I obtained my Master's degree in Informatics in 2013 and my Bachelors' degree in Engineering in 2011.

I spent a half of 2016 at UC Berkeley as a visiting scholar (January -- July), hosted by Prof. Sanjam Garg.

Email: kiyoshima.susumu at


Conference Papers