Research And Analysis of Predicate Encryption Based on Hierarchical Permission

In order to improve storage utilization and reduce communication bandwidth, data deduplication technology is widely used in cloud storage service system. However, there is a conflict between data security and data deduplication brought by encryption technology. This paper introduces a predicate encryption method based on hierarchical authority, which mainly includes system model, attack model definition and implementation scheme. The scheme is an encryption algorithm based on two-way vector space, which mainly contains six sub algorithms of polynomial computing time. At the same time, the performance and security of the scheme are analyzed. Theoretical analysis and experimental results show that the scheme is a safe, effective and efficient scheme.