Efficient Traceable Oblivious Transfer Schemes with Aceess Control

In light of the rapid advancement of information technology, data privacy and security have emerged as critical societal concerns. There is an urgent need for the effective implementation of data access control and traceability mechanisms regarding the management of sensitive information.To address this issue, this paper presents an efficient traceable Oblivious Transfer with Access Control (AC-TOT) scheme that integrates traceability and access control mechanisms, with its core design rooted in cryptographic symmetry principles—specifically leveraging the symmetric properties of bilinear pairings to achieve consistent bidirectional verification of security parameters between protocol participants. Our scheme could ensure that only authorized users can access services from the server in a privacy-preserving manner, with the server being aware solely of the number of accessible services while remaining oblivious to their specific content. Furthermore, the scheme permits recipients to access services without undergoing identity verification, thereby mitigating the risk of personal information disclosure. The security analysis demonstrates that the proposed scheme effectively prevents user abuse and enables the sender to trace improper behaviors.