Blockchain-based Multi-user Dynamic Verifiable Searchable Encryption For Secure Data Storage And Query On Malicious Cloud Server

Abstract

Cloud Computing Has Become The Dominant Platform For Scalable Data Storage And Distributed Services. Despite Its Advantages, Outsourcing Sensitive Data To Untrusted Cloud Servers Introduces Confidentiality And Integrity Risks. Dynamic Searchable Symmetric Encryption (DSSE) Enables Users To Search Encrypted Data Without Revealing Plaintext Information, Yet Most Existing Schemes Assume Single-user Environments Or Semi-honest Servers. This Paper Presents A Blockchain- Based Multi-user Dynamic Verifiable Searchable Encryption Framework Designed For Malicious Cloud Settings. The Proposed System Stores Lightweight Index Metadata On A Blockchain To Ensure Tamper- Proof Verification While Preserving Storage Efficiency. A Cuckoo Filter- Based Index Combined With A Merkle Hash Tree Enables Efficient And Verifiable Search Operations. Secure Multi-user Key Management Is Achieved Using Diffie– Hellman Key Exchange, Eliminating Reliance On Centralized Trust Authorities.

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