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Since the seminal result of Kilian, Oblivious Transfer has proven to be a fundamental primitive in cryptography. In such a scheme, a user is able to gain access to an element owned by a server, withou...
In a group signature scheme, users can anonymously sign messages on behalf of the group they belong to, yet it is possible to trace the signer when needed. Since the first proposal of lattice-based gr...
Based on the identity-based encryption (IBE) from lattices by Agrawal et al. (Eurocrypt'10), Micciancio and Peikert (Eurocrypt'12) presented a CCA1-secure public-key encryption (PKE), which has the be...
Group signature is a central tool for privacy-preserving protocols, ensuring authentication, anonymity and accountability. It has been massively used in cryptography, either directly or through varian...
In a designated verifier signature (DVS) scheme a signer creates a signature which is only verifiable by a designated verifier. A DVS is a useful scheme for authenticating a signer without disturbing ...
In a designated verifier signature (DVS) scheme, the validity of the signature can only be verified by a designated entity chosen by the signer. Furthermore, the designated entity cannot convince a th...
Blind signatures are at the core of e-cash systems and has numerous other applications. In this work we construct efficient blind and partially blind signature schemes over bilinear groups in the stan...
Public key encryption with equality test (PKEET) is a cryptosystem that allows a tester who has trapdoors issued by one or more users UiUi to perform equality tests on ciphertexts encrypted using publ...
In broadcast encryption schemes, a distribution center broadcasts an encrypted message to a subset SS chosen from a universe of receivers and only the intended users are able to decrypt the message. M...
At Crypto’15 Fuchsbauer, Hanser and Slamanig (FHS) presented the first standardmodel construction of efficient round-optimal blind signatures that does not require complexity leveraging. It is conce...
In this paper, we propose a construction of fair and efficient mutual Private Set Intersection (mPSI) with linear communication and computation complexities, where the underlying group is of prime ord...
LaMacchia, Lauter and Mityagin presented a strong security model for authenticated key agreement, namely the eCK model. They also constructed a protocol, namely the NAXOS protocol, that enjoys a simpl...
We present a signature scheme provably secure in the standard model (no random oracles) based on the worst-case complexity of approximating the Shortest Vector Problem in ideal lattices within polyno...
We study the adaptive security of constrained PRFs in the standard model. We initiate our exploration with puncturable PRFs. A puncturable PRF family is a special class of constrained PRFs, where the ...
This paper provides the first efficient, standard-model, fully-secure schemes for some related and challenging forms of public-key encryption (PKE), namely deterministic and hedged PKE. These forms ...

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