Delight @ Keio SFC-RG

Keio University Nakamura Joint Lab. Delight Group

Delight group is a research group of the Nakamura Joint Research Group at SFC, Keio University, focusing on decentralized and distributed systems. With the spread of the Internet, issues arising from the reliability of information circulating in cyberspace are becoming apparent rapidly. In collaboration with the Data Architecture Lab at Keio Research Institute at SFC, we are working on solving issues of decentralized and distributed systems and on research activities in various application fields.

We are always welcome to new members.
If you are interested in our research, please check the following page.

Research Topics:

Decentralized and Distributed Systems

Digital Identity
Verifiable Data Architecture
Network Architecture

Digital Identity

Digital identity is a set of information in cyberspace that is associated with entities in the real world. Technologies related to digital identity play a significant role as a bridge between cyberspace and physical space. We are discussing and researching the architecture of digital identity infrastructure and the feasibility of self-sovereign identity from the viewpoint of "trust."

Verifiable Data Architecture

To developing digital civilization, It is essential to ensure the reliability of the information we communicate over the Internet. In particular, it is important to verify the authenticity of data that describes certain information and to efficiently process the described information (machine readability). We are researching system architectures that apply data models based on Verifiable Credentials and Decentralized Identifiers, which W3C is standardizing.

Network Architecture

Knowledge of computers and networks is essential when discussing digital identities and verifiable data architectures, including distributed systems, network security, and communication protocols. At Delight, we build our network systems from physical machines for research purposes, and they also build and operate virtual machines in the network to test and experiment with software they have created. Students can acquire knowledge of both hardware and software.

News

Our new journal paper by Ryosuke Abe, project research associate, et al. is published in IEEE Access

Jan 6, 2025

Our new journal paper by Ryosuke Abe, project research associate, et al. is published in IEEE Access

Ryosuke Abe, project research associate, won the Best Paper Award at the Asian Internet Engineering Conference (AINTEC) 2023.

Dec 22, 2023

We are pleased to announce that Ryosuke Abe, a project research associate in our group, presented a paper at the Asian Internet Engineering Conference (AINTEC) 2023 and won the Best Paper Award. In this study, they measured the parties' attitudes in the order transaction on the blockchain-based escrow service by the visualizing transaction history, and they designed an incentive mechanism to make the parties behave honestly.

Delight will exhibit at SFC Open Research Forum 2023

Nov 24, 2023

Nakamura Joint Laboratory Delight Group will exhibit at SFC Open Research Forum 2023.

Announcement of reforming a new group "Delight": Kumo and Bcali are now togther.

Sep 27, 2023

We are pleased to announce that Kumo and Bcali, which are parts of SFC-RG groups, have been merged into a new group, "Delight", following the developmental dissolution of both of them. The new group "Delight" will continue the activities of Kumo and Bcali, especially focus on research and development related to "distributed systems" and "decentralized systems".

Publications

A Conceptual Model for Claim Validation Based on Cryptographically Signed Data

In this paper, we propose a conceptual model for claim validation based on signed data while clarifying the gap between validation and verification. As various activities are conducted via the Interne...

Ryosuke Abe，Shigeya Suzuki，Osamu Nakamura

IEEE Access volume: 13

Dec 2024

Mitigation of Seller and Buyer's Dilemma with Transaction History and Escrow

In this paper, to estimate the risk of economic loss incurred by both parties in production order transactions, we propose a scheme that enables escrow and confirmation of the results without relying ...

Ryosuke Abe，Seiyo Kurita，Mariko Kobayashi，Shigeya Suzuki

Proceedings of the 18th Asian Internet Engineering Conference 2023 (AINTEC '23), ACM

Dec 2023

A System for Selective Disclosure of Information about a Patient with Intractable Disease

To receive effective treatment during emergency response due to seizures or unforeseen accidents, a patient with intractable diseases must disclose information about their disease to an emergency phys...

Erika Sugita，Ryosuke Abe，Shigeya Suzuki，Keisuke Uehara，Osamu Nakamura

2023 IEEE 47th Annual Computers, Software, and Applications Conference (COMPSAC)

Jul 2023

A new scheme combining zk Rollup on top of Optimistic Rollup to make transactions cheaper without compromising security

Transaction processing capacity limits the utility of Ethereum, one of the most well-known blockchain mainly used as a decentralized application. To enable more diverse applications, it is required to...

Ko Kikuchi

卒業論文

Mar 2023

* Includes papers published in former groups, Kumo and Bcali.