“Every Dog Has His Day”: Competitive-Evolving-Committee Proactive Secret Sharing With Capability-Based Encryption

Chuyi Yan, Haixia Xu and Peili Li
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Chuyi Yan: Institute of Information Engineering, Chinese Academy of Sciences, China
Haixia Xu: Institute of Information Engineering, Chinese Academy of Sciences, China
Peili Li: National Engineering Research Center for Cryptography, China

International Journal of Information Security and Privacy (IJISP), 2023, vol. 17, issue 1, 1-27

Abstract: This article proposes a competitive-evolving-committee proactive secret sharing. Every participant in the system has the opportunity to become a member of the holding committee and have sufficient anonymity. During the life cycle of serving as the holding committee members, they only send one message in the protocol without excessive interaction, and achieve receiver strong anonymity with a capability-based encryption scheme different from most public-key encryption schemes, at present named RiddleEncryption, which is also proposed in this paper. In RiddleEncryption the sender does not need to pay attention to the specific identity of the receiver but focuses on what kind of capability the receiver should have. Nobody can determine this kind of capability at the beginning of the system establishment. This article aims at depositing a secret in a distributed manner (e.g., blockchain) without excessive trust and to emphasize more anonymity and capability. The scheme can be used in the dynamic groups, authentication management, rights abuse prevention, and so on.

Date: 2023
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