Decentralized and Anonymous Attribute-Based Searchable Encryption With Policy Update and Batch Revocation for Computing Power Network

computing power network (CPN) can possess powerful data computing capabilities and storage resources by equipping a host of computing nodes. However, data sharing in the CPN faces significant challenges, particularly in data security and access control. attribute-based searchable encryption (ABSE) is a feasible technology to tackle this problem. Nevertheless, CPNs typically contain a vast amount of sensitive data that requires strict fine-grained retrieval permissions. Hence, we construct a decentralized and anonymous ABSE scheme with policy update and batch revocation for CPN, highlighting the generation of keyword indexes based on access structure. Meanwhile, considering the limited computing power of users, we transfer the time-consuming calculation to the edge computing node. Besides, security analysis indicates that our scheme can achieve the security of chosen plaintext attack and chosen keyword attack, collusion resistance, forward and backward security. Experimental evaluations demonstrate that our scheme is trustworthy and applicable to CPNs.