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Learn about ShieldReduce, a secure outsourced storage system that addresses the conflicting goals of storage savings and data confidentiality in backup management through this 17-minute conference presentation from USENIX ATC '25. Discover how researchers from the University of Electronic Science and Technology of China and The Chinese University of Hong Kong developed a solution that enables fine-grained shielded data reduction by applying deduplication, delta compression, and local compression within Intel SGX trusted execution environments. Explore the system's novel hybrid inline and offline compression design that uses bi-directional delta compression to maintain physical locality of base chunks while mitigating I/O overhead in SGX environments. Understand how ShieldReduce overcomes the limitations of traditional deduplication-aware encryption approaches that are incompatible with fine-grained delta and local compression techniques. Examine the evaluation results across various backup workloads demonstrating significant performance improvements over shielded baselines without bi-directional delta compression, while achieving storage savings comparable to fine-grained data reduction for plain data, effectively bridging the gap between security and storage efficiency in outsourced backup systems.
