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Instead of using the P2P channel for the entire file, users can upload information about the file on a common CSP and share only the essential information that enables the receiver to download and recover the original file. Although users can rely on a secure peer-to-peer (P2P) channel for file sharing, this introduces potential delay on the data transfer and requires the sender to remain active and connected while the transfer process occurs. We consider the problem of sharing sensitive or valuable files across users while partially relying on a common, untrusted third-party, e.g., a Cloud Storage Provider (CSP). Our trace-driven testbed evaluation shows that our REED prototype maintains high performance and storage efficiency. We implement a REED prototype with various performance optimization techniques and demonstrate how we can exploit similarity to mitigate key generation overhead. We propose two REED encryption schemes that trade between performance and security, and extend REED for dynamic access control. REED builds on a deterministic version of all-or-nothing transform (AONT), such that it enables secure and lightweight rekeying, while preserving the deduplication capability. We design and implement REED, a rekeying-aware encrypted deduplication storage system.
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However, it is non-trivial to realize efficient rekeying in encrypted deduplication storage systems, which use deterministic content-derived encryption keys to allow deduplication on ciphertexts. It renews security protection, so as to protect against key compromise and enable dynamic access control in cryptographic storage. Rekeying refers to an operation of replacing an existing key with a new key for encryption.