IACR News item: 04 January 2013
Yu Chen, Zongyang Zhang, Dongdai Lin, Zhenfu Cao
ePrint ReportIn the central of our generalization, we lift subset membership problem to distribution distinguish problem.
Our generalized HPS clarifies and encompass all the known public-key encryption (PKE) schemes
that essentially implement the idea of hash proof system.
Moreover, besides existing smoothness property, we introduce an additional property named anonymity for HPS.
As a natural application, we consider anonymity for PKE in the presence of key-leakage,
and provide a generic construction of leakage-resilient anonymous PKE from anonymous HPS.
We then extend our generalization to the identity-based setting.
Concretely, we generalize the paradigm of identity-based hash proof system (IB-HPS)
proposed by Boneh~\\textit{et al.}~\\cite{BGH2007} and Alwen~\\textit{et al.}~\\cite{Alwen2010},
and introduce anonymity for it. As an interesting application of anonymous IB-HPS,
we consider security for public-key encryption with keyword search (PEKS) in the presence of token-leakage,
and provide a generic construction of leakage-resilient secure PEKS from leakage-resilient anonymous IBE,
which in turn is based on anonymous IB-HPS.
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