Encrypted deduplication combines encryption and deduplication in a seamless way to provide confidentiality guarantees for the physical data in deduplication storage, yet it incurs substantial metadata storage overhead due to the additional storage of keys. Metadedup is a new encrypted deduplication storage system, which suppresses metadata storage by also applying deduplication to metadata. Its idea builds on indirection, which adds another level of metadata chunks that record metadata information. We find that metadata chunks are highly redundant in real-world workloads and hence can be effectively deduplicated. In addition, metadata chunks can be protected under the same encrypted deduplication framework, thereby providing confidentiality guarantees for metadata as well.
Metadedup is developed by the School of Computer Science and Engineering at the University of Electronic Science and Technology of China (UESTC) and the Applied Distributed Systems Lab in the Department of Computer Science and Engineering at the Chinese University of Hong Kong (CUHK).