Ensuring Secure Cloud Storage with Dual-Server Public-Key Encryption Enabling Keyword Search

  • Unique Paper ID: 168389
  • Volume: 11
  • Issue: 5
  • PageNo: 737-749
  • Abstract:
  • Searchable encryption is a critical component of safeguarding data privacy in cloud storage environments. By enabling efficient keyword-based searches on encrypted data, searchable encryption empowers users to retrieve specific information without compromising the confidentiality of the underlying data. While public-key encryption with keyword search (PEKS) offers a promising solution, traditional PEKS systems are susceptible to keyword guessing attacks (KGA) by malicious cloud servers. These attacks exploit the inherent leakage of information in PEKS schemes, allowing adversaries to infer sensitive keywords based on search results. To address this vulnerability and enhance the security of searchable encryption, we propose a novel dual-server PEKS (DS-PEKS) framework. Our approach introduces a layer of indirection by splitting the search functionality across two non-colluding cloud servers. This separation of duties prevents any single server from gaining complete knowledge of the search keywords, thereby mitigating the risk of KGA. To further strengthen the security of our DS-PEKS framework, we leverage a newly introduced linear and homomorphic smooth projective hash function (LH-SPHF). LH-SPHF is a cryptographic primitive that combines the properties of linearity and homomorphism, enabling efficient and secure keyword search operations. By integrating LH-SPHF into our DS-PEKS construction, we ensure that the search process remains private and resistant to attacks. Our proposed DS-PEKS system offers several advantages over traditional PEKS schemes. First, it provides robust protection against KGA by preventing any single cloud server from gaining complete control over the search process. Second, it leverages the power of LH-SPHF to ensure the privacy and security of keyword searches. Third, our DS-PEKS construction is efficient and scalable, making it suitable for deployment in real-world cloud storage environments. In summary, our dual-server PEKS framework, combined with the use of LH-SPHF, represents a significant advancement in the field of searchable encryption. By addressing the shortcomings of traditional PEKS systems and providing a secure and efficient solution for keyword search on encrypted data, our approach contributes to the protection of sensitive information in cloud storage.

Cite This Article

  • ISSN: 2349-6002
  • Volume: 11
  • Issue: 5
  • PageNo: 737-749

Ensuring Secure Cloud Storage with Dual-Server Public-Key Encryption Enabling Keyword Search

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