A new approach for private searches on public-key encrypted data

摘要: Public-key Encryption with Keyword Search (PEKS) allows authorized users to search by keywords on encrypted data generating trapdoors for the desired keywords. Basically there are two requirements process of generation. On one hand, it is important allow privately without revealing Trapdoor Generation Entity $\mathcal{TGE}$, and solutions proposed based use blinding protocols between user $\mathcal{TGE}$. other in some applications necessary prevent $\mathcal{TGE}$ from behalf a legitimate user, this done splitting distributed manner. Until now, these PEKS were considered separately many dealing each one. However, no solution known satisfy at same time. In paper we present new approach deal issue. First, extend notion anonymous Identity-Based Private Key Generator handle blind key-extraction as Blind IBE. We call such schemes (n,t)-IBE, give concrete construction schemes. Second, generically transform (n,t)-IBE into threshold oblivious keyword satisfying specified above.