I am a cryptographer working at NTT, Japan. My main research area is the foundations of cryptography. In particular, I am 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.

In 2016, I stayed at UC Berkeley as a visiting scholar (hosted by Prof. Sanjam Garg).

Email: kiyoshima.susumu at


Conference Papers