关键词: 可搜索加密, 属性加密, 访问控制, 连接关键词

Abstract: The attribute-based encryption mechanism enables fine-grained access control and supports multi-user data sharing. Aiming at the problems of inefficiency, easy key leakage and only supporting single keyword search in most attribute-based searchable encryption schemes, an attribute-based encryption scheme supporting conjunctive keyword search is proposed. The scheme uses a linear secret sharing scheme to implement access control, and performs secret sharing and recovery operations in a matrix associated wit-h the attributes of the participants, which reduces the amount of calculation through matrix operations. In the trapdoor generation stage, the user key is not directly submitted to the cloud server, thus ensuring the security  of the user key. Based on the polynomial equation, conjunctive keyword search is realized to narrow the search scope and improve the user’s search experience. Strict security analysis proves that the scheme can achieve security against keyword attacks.

Key words: searchable encryption, attribute-based encryption, access control, conjunctive keyword