关键词: 可搜索加密, 属性基加密, 可问责, 多关键字, 在线/离线

Abstract: In order to solve the problem that the existing searchable encryption schemes cannot track the identity of the private key leaker, this paper proposes an accountable multi-keyword ciphertext search scheme. By introducing a tracking algorithm, the identity of the private key owner is tracked based on the private key that is leaked or sold,and the user is held accountable. If it is determined that the user is a leaker, it can be revoked directly from the system to ensure the security of the system. This scheme has proven to be accountable and based on[q'- SDH]assumption it is secure. At the same time, the scheme in this paper divides the encryption phase into online encryption and offline encryption, which effectively reduces the calculation amount of online encryption and improves the overall operating efficiency of the system. In addition, the scheme also supports multi-keyword query, narrowing the query scope for users, and improving search efficiency. Finally, the security proof and experimental analysis are given to prove that the scheme is safe and feasible.

Key words: searchable encryption, attribute-based encryption, accountability, multi-keyword, online/offline