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Proofs of knowledge (PoK) are one of the most fundamental notions in cryptography and have been used as a building block in numerous applications. The appeal of this notion is that it is parameterized...
Blockchains based on proofs of work (PoW) currently account for more than 90% of the total market capitalization of existing digital cryptocurrencies. The security of PoW-based blockchains requires th...
We propose a framework for constructing efficient designated-verifier non-interactive zero-knowledge proofs (DVNIZK) for a wide class of algebraic languages over abelian groups, under standard assumpt...
Since their introduction in 1985, by Goldwasser, Micali and Rackoff, followed by Feige, Fiat and Shamir, zero-knowledge proofs have played a significant role in modern cryptography: they allow a par...
We formalise the notion of adaptive proofs of knowledge in the random oracle model, where the extractor has to recover witnesses for multiple, possibly adaptively chosen statements and proofs. We a...
In this note, we show the existence of \emph{constant-round} computational zero-knowledge \emph{proofs of knowledge} for all $\NP$. The existence of constant-round zero-knowledge proofs was proven by ...
In this note, we provide a formal proof of the fact that any protocol that is a zero-knowledge proof of knowledge for a relation $R$ is also a secure protocol for the zero-knowledge proof of knowledge...
Zero-knowledge proofs of knowledge (ZK-PoK) are important building blocks for numerous cryptographic applications. Although ZK-PoK have very useful properties, their real world deployment is typically...
Efficient zero-knowledge proofs of knowledge (ZK-PoK) are basic building blocks of many practical cryptographic applications such as identification schemes, group signatures, and secure multiparty c...
It is well known that all the known black-box zero-knowledge proofs of knowledge for NP are nonconstant- round. Whether there exit constant-round black-box zero-knowledge proofs of knowledge for all...
In this paper we consider the problem of increasing the number of possible challenge values from 2 to s in various zero-knowledge cut and choose protocols. First we discuss doing this for graph isom...
In this paper, we study the opacity property of verifiably encrypted signatures (VES) of Boneh et al. (proposed in Eurocrypt 2003). Informally, opacity implies that although some given aggregate sign...
We introduce a new notion called `-isolated proofs of knowledge (`-IPoK). These are proofs of knowledge where a cheating prover is allowed to exchange up to ` bits of communication with some external...

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