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Functional Encryption in the Bounded Storage Models. (arXiv:2309.06702v1 [cs.CR])
cs.CR updates on arXiv.org arxiv.org
Functional encryption is a powerful paradigm for public-key encryption which
allows for controlled access to encrypted data. This primitive is generally
impossible in the standard setting so we investigate possibilities in the
bounded quantum storage model (BQSM) and the bounded classical storage model
(BCSM). In these models, ciphertexts potentially disappear which nullifies
impossibility results and allows us to obtain positive outcomes.
Firstly, in the BQSM, we construct information-theoretically secure
functional encryption with $\texttt{q}=O(\sqrt{\texttt{s}/\texttt{r}})$ where
$\texttt{r}$ can be set to any …
access data encrypted encrypted data encryption key paradigm public quantum standard storage