Netinfo Security ›› 2023, Vol. 23 ›› Issue (5): 95-104.doi: 10.3969/j.issn.1671-1122.2023.05.010

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A Proactive Multi-Secret Sharing Scheme for Cloud Storage

PEI Bei1, ZHANG Shuihai2, LYU Chunli2()   

  1. 1. The Third Research Institute of the Ministry of Public Security, Shanghai 200031, China
    2. College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China
  • Received:2022-12-05 Online:2023-05-10 Published:2023-05-15
  • Contact: LYU Chunli E-mail:lvcl@cau.edu.cn

Abstract:

The article proposed a multi-secret sharing method that can be used in cloud storage scenarios. The solution was based on gated cryptography and active security technology and was designed to ensure secure storage of data over long periods of time. In this scheme, the confidential data uploaded by the user was first split into multi secrets, and these secrets were shared secretly. Then, the shadow shares after sharing were selected separately for stored by different cloud service providers, thus satisfying the security of the (k,n) threshold scheme. In this process, the secret distributor was responsible for distributing and sharing the secrets and ensuring that each cloud service provider helds only a shadow share of a portion of the data. To ensure the security of the system, the scheme used a cyclic policy in share update and verification phase such that an attacker can only gain access to the original secret or any information about it if he compromised no less than k cloud service providers in one update cycle. Notably, the scheme avoid direct interaction between various cloud providers, thus reducing the cost of communication interactions between cloud storage providers. At the same time, the scheme used threshold cryptography and active security technology, which can ensure the security of the system and the long-time secure storage of data. The comparative analysis with other schemes proves that the scheme proposed in the paper is more efficient and more suitable for storing large-scale secret data.

Key words: cloud storage, multi-secret sharing, proactive safety, confidential data

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