I’m a research scientist at NTT in Japan. My main research area is cryptography, though I am broadly interested in information security and theoretical computer science. My research focuses on how to protect computer program while preserving its functionality, how to achieve secure computation without leaking information, and designing efficient and versatile cryptographic building blocks. More specific topics are
- Program Obfuscation/Watermarking/Copy-Protection
- Functional Encryption
- Lattice-Based Cryptography
- Quantum Cryptography
- Jun. 2022. A paper on ABE was accepted by Designs, Codes and Cryptography.
- May. 2022. A paper on watermarking against quantum adversaries (Eurocrypt 2022) on ePrint archive and arXiv
- May. 2022. A paper on ZK for QMA was accepted by CRYPTO 2022.
- May. 2022. The revised full version of the paper on IO from SKFE was accepted by Journal of Cryptology.
- Mar. 2022. A paper on functional encryption for Turing machines on ePrint archive
- Feb. 2022. A paper on watermarking PRFs against quantum adversaries was accepted by Eurocrypt 2022.
- Jan. 2022. Invited to be a program committee member of CRYPTO 2022.
- Dec. 2021. Invited to be a program committee member of TCC 2022.
- Dec. 2021. A merged paper of this qunatum encryption paper and this zero-knowledge paper was accpeted for a short plenary talk by QIP 2022 (merged with another paper).
- Dec. 2021. Invited to be a program committee member of ACM CCS 2022.
- Dec. 2021. A paper on KDM security in the quantum ROM was accepted by PKC 2022.
- Dec. 2021. A paper on updatable encryption was accepted by PKC 2022.
- Please send official invitation mails (PC members, talks, etc.) to
firstname dot lastname dot zk at hco dot ntt dot co dot jp (firstname = ryo)
- For other mails:
- firstname at lastname dot info
- firstname dot lastname at gmail dot com
- Address: NTT Corporation
3-9-11 Midoricho, Musashino-shi, Tokyo 180-8585 Japan
- Visiting associate professor at School of Computing at Tokyo Institute of Technology from 07/2016 -
- Visiting researcher at Northeastern University at Boston during Oct. 2014 - Dec. 2015 (hosted by Daniel Wichs)
- Obtained my Dr. Sci. (corresponding to Ph.D.) from Tokyo Institute of Technology in September 2010 (adviser: Keisuke Tanaka)
- Joined NTT Information Sharing Platform Laboratories (now, NTT Social Informatics Laboratories) in 2007
- Completed my Master’s degree in Informatics at Graduate School of Informatics Kyoto University in 2007
- Completed my Bachelor’s degree in Engineering at Kyoto University in 2005
On pronunciation of my first name
I do not know English words whose pronunciation are exactly the same as that of Ryo. The pronunciation of Rio, which is the name of a city in Brazil, is similar to that of Ryo.