Batch-Puncturing Circuit CP-ABE (and More) from Lattices

본문 미리보기

Puncturable attribute-based encryption ($\mathsf{PABE}$) not only supports fine-grained access control over encrypted data, but also enables users to revoke the decryption capability for specific messages by puncturing tags, thereby achieving fine-grained forward security. It finds wide applications in scenarios such as sharing government classified documents and personal health records. However, existing $\mathsf{PABE}$ schemes only support tag-by-tag puncturing, where each puncturing operation