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Related Experiment Video

Updated: Jan 29, 2026

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DS-CKDSE: A Dual-Server Conjunctive Keyword Dynamic Searchable Encryption with Forward and Backward Security.

Haiyan Sun1, Yihua Liu1, Yanhua Zhang2

  • 1Software Engineering College, Zhengzhou University of Light Industry, Zhengzhou 450001, China.

Entropy (Basel, Switzerland)
|January 28, 2026
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Summary

This study introduces a dual-server conjunctive keyword Dynamic Searchable Encryption (DSE) scheme. It enhances security by preventing keyword pair result pattern leakage and achieving forward/backward security for encrypted cloud data.

Keywords:
backward securityconjunctive keyword searchdynamic searchforward security

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Area of Science:

  • Computer Science
  • Cryptography
  • Cloud Security

Background:

  • Dynamic Searchable Encryption (DSE) is crucial for secure cloud data searching.
  • Existing single-server DSE schemes suffer from Keyword Pair Result Pattern (KPRP) leakage and lack simultaneous forward/backward security.

Purpose of the Study:

  • To propose a novel dual-server conjunctive keyword DSE scheme (DS-CKDSE).
  • To address KPRP leakage and achieve robust forward and backward security.
  • To support efficient conjunctive queries over encrypted data.

Main Methods:

  • A dual-server architecture is employed.
  • A secure index is constructed using a full binary tree and an Indistinguishable Bloom Filter (IBF).
  • Random state updates, dual-state arrays, and timestamp trapdoors ensure security and functionality.

Main Results:

  • The DS-CKDSE scheme mitigates KPRP leakage by separating index storage and trapdoor verification.
  • The scheme satisfies adaptive security under a defined leakage function.
  • Experimental results demonstrate high efficiency in update and search operations.

Conclusions:

  • The proposed dual-server DSE scheme effectively enhances security and efficiency for confidential cloud data searching.
  • It provides a robust solution against known leakage attacks while maintaining performance.