## Cryptology ePrint Archive: Report 2020/1612

A New Efficient Hierarchical Multi-secret Sharing Scheme Based on Linear Homogeneous Recurrence Relations

Jiangtao Yuan and Jing Yang and Guoai Xu and Xingxing Jia and Fang-wei Fu and Chenyu Wang

Abstract: Hierarchical secret sharing is an important key management technique since it is specially customized for hierarchical organizations with different departments allocated with different privileges, such as the government agencies or companies. Hierarchical access structures have been widely adopted in secret sharing schemes, where efficiency is the primary consideration for various applications. How to design an efficient hierarchical secret sharing scheme is an important issue. In 2007, a famous hierarchical secret sharing (HSS) scheme was proposed by Tassa based on Birkhoff interpolation, and later, based on the same method, many other HSS schemes were proposed. However, these schemes all depend on Polya's condition, which is a necessary condition not a sufficient condition. It cannot guarantee that Tassa's HSS scheme always exists. Furthermore, this condition needs to check the non-singularity of many matrices. We propose a hierarchical multi-secret sharing scheme based on the linear homogeneous recurrence (LHR) relations and the one-way function. In our scheme, we select $m$ linearly independent homogeneous recurrence relations. The participants in the highly-ranked subsets $\gamma_1, \gamma_2 ,\cdots, \gamma_{j-1}$ join in the $j$-th subset to construct the $j$-th LHR relation. In addition, the proposed hierarchical multi-secret sharing scheme just requires one share for each participant, and keeps the same computational complexity. Compared with the state-of-the-art hierarchical secret sharing schemes, our scheme has high efficiency.

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

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

Contact author: jiangt_yuan at 163 com

Available format(s): PDF | BibTeX Citation

Short URL: ia.cr/2020/1612

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