## Cryptology ePrint Archive: Report 2020/1615

An Ideal Compartmented Secret Sharing Scheme Based on Linear Homogeneous Recurrence Relations

Jiangtao Yuan and and Guoai Xu and Guosheng Xu

Abstract: Multipartite secret sharing schemes are those that have multipartite access structures. The set of the participants in those schemes is divided into several parts, and all the participants in the same part play the equivalent role. One type of such access structure is the compartmented access structure. We propose an ideal and efficient compartmented multi-secret sharing scheme based on the linear homogeneous recurrence (LHR) relations. In the construction phase, the shared secrets are hidden in some terms of the linear homogeneous recurrence sequence. In the recovery phase, the shared secrets are obtained by solving those terms in which the shared secrets are hidden. When the global threshold is $t$, our scheme can reduce the computational complexity from $O(n^{t-1})$ to $O(n^{\max(t_i-1)}\log n)$, where $t_i<t$. The security of the proposed scheme is based on Shamir's threshold scheme. Moreover, it is efficient to share the multi-secret and to change the shared secrets in the proposed scheme. That is, the proposed scheme can improve the performances of the key management and the distributed system.

Category / Keywords: secret-key cryptography / secret sharing, linear homogeneous recurrence relations, compartmented access structure, multi-secret

Date: received 29 Dec 2020, last revised 31 Dec 2020

Contact author: jiangt_yuan at 163 com

Available format(s): PDF | BibTeX Citation

Short URL: ia.cr/2020/1615

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