Flexible and Efficient Multi-Keyword Ranked Searchable Attribute-Based Encryption Schemes

Currently, cloud computing has become increasingly popular and thus, many people institutions choose to put their data into the instead of local environments. Given massive amount fidelity servers, adequate security protection efficient retrieval mechanisms for stored have critical problems. Attribute-based encryption brings ability fine-grained access control can achieve a direct encrypted search while being combined with searchable algorithms. However, most existing schemes only support single-keyword or provide no ranking searching results, which could be inflexible inefficient in satisfying real world’s actual needs. We propose flexible multi-keyword ranked attribute-based scheme using trees overcome above-mentioned problems, allowing users combine fuzzy keywords AND–OR logic gates. Moreover, our enhanced not improves its privacy but also goes step further apply semantic boost flexibility experience users. With proposed index-table method tree-based algorithm, we proved efficiency through series analyses experiments.