Public data as a data element can significantly empower government public services and social governance.However,frequent data breaches severely hinder the progress of public data sharing.Existing attribute-based encryption schemes,while enabling secure access to public data,suffer from inefficiencies in authorization management and difficulties in control after sharing,making them unsuitable for current public data sharing models.Therefore,this paper proposed a public data sharing scheme that was controllable throughout the entire lifecycle.The scheme began with a data capsule encapsulation method that deeply bound shared public data with access authorization policies;it then constructed a multi-party,layered authorization and lifecycle-aware access control method for the shared data.Security and experimental simulation analyses demonstrate that the scheme achieves controllable public data sharing throughout its entire lifecycle,with minimal overhead and meeting practical needs.
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