Development and Application Research on a Proxy Re-encryption Scheme for Symmetric Key Cryptography with Support for Cipher Algorithm Delegation

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K11811
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 60070:Information security-related
• Research Institution: Hiroshima University
• Principal Investigator: WATANABE HIDENOBU 広島大学, 情報メディア教育研究センター, 准教授 (80611631)
• Co-Investigator(Kenkyū-buntansha): 大東 俊博 東海大学, 情報通信学部, 教授 (80508127)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: エッジコンピューティング / プロキシ再暗号化 / Intel SGX

Outline of Final Research Achievements

We proposed a proxy re-encryption scheme for symmetric key cryptography-based that enables the change of encryption algorithms on the server side without decrypting the ciphertext and developed a re-encryption processing delegation system. We clarified that the time required for users to delegate re-encryption processing can be kept to about one second by utilizing the hardware security mechanism Intel Software Guard Extension (Intel SGX), while changing the encryption algorithm without decrypting the ciphertext. This result shows the compatibility of improving the efficiency of re-encryption processing and reducing the burden on users.

Free Research Field

情報科学

Academic Significance and Societal Importance of the Research Achievements

本研究成果により，データを秘匿したまま利用者自身が自身の暗号文をいつ，どこで，再暗号化処理をさせるかを制御することが可能になるため，プライバシーやデータの安全性を強化できる．また，蓄積され続ける研究データの機密性を長期的に保護することが求められる研究データ管理の観点においても活用が期待できる．さらに，Society5.0の実現に向けて信頼のある自由なデータ流通のプラットフォームに展開も見込める点で社会的意義は大きい。