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" Certificateless public-key cryptosystem " is a new and attractive paradigm, which avoids the inherent key escrow property in identity-based public-key cryptosystems, and does not need expensive certificates as in the public key infrastructure. A strong security model for certificateless public key encryption was established by Al-Riyami and Paterson in(More)
Identity-based (ID-based) public key cryptosystem can be a good alternative for certificate-based public key setting, especially when efficient key management and moderate security are required. A proxy signature scheme permits an entity to delegate its signing rights to another entity. But to date, no ID-based proxy signature scheme with prov-able security(More)
In this paper, we present a practical and provably secure two-pass AKE protocol from ideal lattices, which is conceptually simple and has similarities to the Diffie-Hellman based protocols such as HMQV (CRYPTO 2005) and OAKE (CCS 2013). Our protocol does not rely on other cryptographic primitives—in particular, it does not use signatures—simplifying the(More)
In this paper we investigate the topic of integrated public-key encryption (PKE) and public-key encryption with keyword search (PEKS) schemes (PKE-PEKS as shorthand). We first formalize the strongest security notion to date for PKE-PEKS schemes, named joint CCA-security. We then propose two simple constructions of jointly CCA-secure PKE-PEKS schemes from(More)
In this paper, we present a new construction of expressive attribute-based signature scheme which is proven existentially unforge-able in the standard model for the selective adversary. In addition, this scheme can also achieve perfect privacy, which means the signature reveals nothing about the identity or attribute information about the real signer.(More)