An Efficient and Secure Access Authorization Policy for Cloud Storage Resources Based on Fuzzy Searchable Encryption

When fuzzy searchable encrypted cloud storage resources are available, keywords are allowed to have a certain range of changes. Even if there are slight differences in the spelling, word order, or spacing between words, the correct data can be matched. Therefore, it does not have the effect of finegrained access control (FGAC). Consequently, to satisfy the security demands of cloud storage assets and the ease of resource retrieval through fuzzy searchable encryption, CP-ABE employs attribute and policy definitions to introduce a novel, effective security access authorization approach for cloud storage assets utilizing fuzzy searchable encryption technology. Encrypt cloud storage resources after keyword preprocessing through initialization, file encryption and decryption, index generation encryption, search, and other steps; use the wildcard-based method to generate indexes; and use the Bloom filter to generate security traps to achieve Pail lier-based asymmetric fuzzy searchable encryption of resources. In combination with the CPABE-based access control method, authorized users are assigned private keys in the authorization center to ensure that unauthorized users cannot obtain cloud storage resources and complete the fuzzy searchable encryption access authorization of cloud storage resources. The experiment shows that the search index generation of this strategy greatly reduces the resource utilization rate and effectively improves the fuzzy search speed. Moreover, the combination of fuzzy searchable encryption and CP-ABE can better ensure full cloud storage resources.