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Tramy: A Multi-Client Dynamic Searchable Symmetric Encryption With Malicious Servers Tracking for Conjunctive Queries
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Summary
Tramy is a dynamic searchable symmetric encryption scheme that lets multiple clients run conjunctive queries over encrypted data and tracks malicious servers, addressing a gap in Dory, which supports only single-keyword queries in a single-client setting. It hides the search pattern through a new primitive called Matrix-based Multi-Point Retrieval and uses a Malice-Defend Bloom Filter that supports conjunctive queries and verifies the integrity of server responses. Benchmarks reportedly show resistance to adaptive adversaries and up to 20x performance improvements over the state of the art.