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<p>Dynamic symmetric searchable encryption (DSSE) allows clients to perform keyword searches and updates on encrypted databases outsourced to cloud servers. Ensuring forward privacy is a crucial security property for DSSE schemes to protect data privacy. However, existing forward-private DSSE schemes face significant limitations: they either rely on an honest-but-curious server, assuming it always returns correct search results without providing verification functionality, or they lack support for fine-grained attribute-based searches and access control. As a result, these schemes cannot be directly applied to attribute-based databases. In this paper, we propose the first verifiable forward-private DSSE scheme suitable for attribute-based databases. Specifically, we construct a secure index based on attribute elements to realize fine-grained searches on attribute-value type databases while ensuring the forward privacy of the scheme. We also design a novel verification tag using symmetric homomorphic encryption to verify the correctness of search results. In addition, our scheme achieves access control functionality to ensure that different users can only access authorized files. Experimental evaluations show that our scheme has advantage in the update, search and verification processes. And the security analysis proves our scheme is secure.</p>

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Toward privacy-preserving verifiable DSSE for attribute-based cloud computing system

  • 期刊论文

  • 发表日期：

    2025年1月22日

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  • Tianqi Peng,
  • Bei Gong,
  • Pengxuan Sun

摘要

Dynamic symmetric searchable encryption (DSSE) allows clients to perform keyword searches and updates on encrypted databases outsourced to cloud servers. Ensuring forward privacy is a crucial security property for DSSE schemes to protect data privacy. However, existing forward-private DSSE schemes face significant limitations: they either rely on an honest-but-curious server, assuming it always returns correct search results without providing verification functionality, or they lack support for fine-grained attribute-based searches and access control. As a result, these schemes cannot be directly applied to attribute-based databases. In this paper, we propose the first verifiable forward-private DSSE scheme suitable for attribute-based databases. Specifically, we construct a secure index based on attribute elements to realize fine-grained searches on attribute-value type databases while ensuring the forward privacy of the scheme. We also design a novel verification tag using symmetric homomorphic encryption to verify the correctness of search results. In addition, our scheme achieves access control functionality to ensure that different users can only access authorized files. Experimental evaluations show that our scheme has advantage in the update, search and verification processes. And the security analysis proves our scheme is secure.