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Cryptography, Volume 9, Issue 4

2025 December - 21 articles

Cover Story: Proactive secret sharing (PSS), an extension of secret sharing schemes, protects sensitive data in dynamic networks by periodically refreshing shares. However, explicit user revocation remains challenging in PSS schemes. This work presents a role-based, non-interactive PSS scheme that supports dynamic user management with efficient communication complexity. Before the refresh epoch, a trusted dealer broadcasts a compact ciphertext that encodes share refresh and user update information. Authorized users fall into three roles—retain, new, and rejoin—and can refresh shares independently through homomorphic computations, while revoked users cannot obtain new shares. Hash functions are used to bind revocation parameters, enabling integrity verification without sacrificing non-interactivity. View this paper
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Cryptography - ISSN 2410-387X
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