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
- 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.
- Oct. 2021. A workshop proposal for NII Shonan meeting was accepted. I am an organizer of Workshop on Encrypted Computation / Enhancing Functionality in Cryptography.
- Sep. 2021. A paper on zero-knowledge for QMA on ePrint archive and arXiv.
- Sep. 2021. A paper on KDM security in the quantum ROM on ePrint archive.
- Aug. 2021. The revised full version of this attribute-based encryption paper was accepted by Designs, Codes and Cryptography.
- Aug. 2021. A paper on secure software leasing was accepted by TCC 2021.
- Aug. 2021. A paper on quantum encryption was accepted by Asiacrypt 2021.
- Aug. 2021. The merged and revised version of this NIZK paper and this NIZK paper was accepted by Journal of Cryptology.
- Aug. 2021. The full version of this IO and FE paper on ePrint archive.
- 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 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.