International Journal of Advanced Research in Computer and Communication Engineering

Abstract: Cloud storage solutions often face large amounts of redundant data, leading to inefficient storage resource usage and increased operational expenses. Data deduplication helps to overcome redundancy, but the deduplication of encrypted data raises issues related to security and privacy. This paper proposes an efficient and secure multi-cloud data deduplication solution by combining Multi-Key Homomorphic Proxy Re-Encryption (MKH-PRE) with Elliptic Curve Cryptography (ECC). The proposed design uses Content Defined Chunking (CDC) to divide files into variable-length chunks and ECC-based hashing to generate secure identifiers for deduplication. A Distributed Hash Table (DHT) approach is used to ensure fair data replication among storage nodes, and a Proof-of-Ownership (PoW) method is used to verify authentic users. Performance evaluation shows improved storage resource usage, reduced computational complexity, and secure cross-cloud deduplication suitable for modern cloud setups.

Keywords: Cloud Security, Data Deduplication, MKH-PRE, Content Defined Chunking, Proof of Ownership.

Downloads: | DOI: 10.17148/IJARCCE.2026.15226