A similarity-aware encrypted deduplication scheme with flexible access control in the cloud.

Data deduplication has been widely used in the cloud to reduce storage space. To protect data security, users encrypt data with message-locked encryption (MLE) to enable deduplication over ciphertexts. However, existing secure deduplication schemes suffer from security weakness (i.e., brute-force attacks) and fail to support flexible access control. The process of chunk-level MLE key generation and sharing exists potential privacy issues and heavy computation consumption.