| 研究課題/領域番号 |
23KJ0385
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| 研究機関 | 東京大学 |
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研究代表者 |
劉 可揚 東京大学, 情報理工学系研究科, 特別研究員(DC2)
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| 研究期間 (年度) |
2023-04-25 – 2025-03-31
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| キーワード | Property Preserving / Cryptographic Protocol / Blockchain / DAG-based Consensus |
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| 研究実績の概要 |
1. We propose a framework for digesting private data to protect privacy while revealing specific properties to certain users. With our scheme, the user can create a hash for his data, revealing only a pre-defined property and supporting homomorphic computation.
2. From the application's perspective, we propose optimizing the DAG-based blockchain consensus algorithm to improve latency and user experience. With our protocol, new blockchains can enjoy the high TPS of DAG-based consensus with better transaction latency and verifiable transaction results.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
This research project aims to create a framework for collecting personal, private data. In the last year, we have made two parallel progresses: the way of handling data and the platform for committing data.
We also improved the DAG-based blockchain consensus algorithm for better latency. We hope blockchain technology can have better performance and lower costs so society can eventually use it in more fields.
We also investigated using new cryptographic primitives to publicly use private data without privacy concerns. We typically use a property-preserving hash to hide sensitive information while using homomorphism for better availability.
All the above works are published in international conferences, and the latter won the IEEE Best awards.
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| 今後の研究の推進方策 |
The following works are primarily about connecting the property-preserving data with the committed data in a private way. We are considering using zero-knowledge proof to fill the gap. Thus, when a user commits his verified data set (e.g., a private profile), he can link a property-preserving hash with the whole chain and prove there is a committed certificate that has the data result in this hash. Eventually, the user can commit a data set on blockchain, proving a hash through our property preserving hash and using the zero knowledge proof to prove the link between the hash and the data.
In addition, we are also considering on-chain multi-party computation as an application and studying its potential usage for people to use their data without worrying about privacy leakage.
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| 次年度使用額が生じた理由 |
Due to budge constraint, one of my published papers (for ISC2023) used my supervisors' budget, that is the reason we have unused budget. In the coming year, we project to participate in two more conference which will need to use the left budget.
In the next year, we plan to participate two international conference and may continually to purchase service and devices for research.
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