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We propose a decentralized multi-authority anonymous authentication scheme in which a prover and a verifier are non-interactive. We give two security definitions; resistance against collusion attacks ...
In this work, we revisit multi-authority attribute based signatures (MA-ABS), and elaborate on the limitations of the current MA-ABS schemes to provide a hard to achieve (yet very useful) combination ...
In this work, we revisit the primitive functional encryption (FE) for inner products and show its application to decentralized attribute- based encryption (ABE). Particularly, we derive an FE for inne...
Distributed credit networks, such as Ripple and Stellar, are becoming popular as an alternative means for financial transactions. However, the current designs do not preserve user privacy or are not t...
A blockchain system is a replicated state machine that must be fault tolerant. When designing a blockchain system, there is usually a trade-off between decentralization, scalability, and security. In ...
Public-key infrastructures (PKIs) are an integral part of the security foundations of digital communications. Their widespread deployment has allowed the growth of important applications, such as, int...
Ledger-based systems that enable rich applications often suffer from two limitations. First, validating a transaction requires re-executing the state transition that it attests to. Second, transaction...
Machine learning and group testing are quite useful methods for many different fields such as finance, banks, biology, medicine, etc. These application domains use quite sensitive data, and huge amoun...
Attribute-based encryption (ABE) enables limiting access to encrypted data to users with certain attributes. Different aspects of ABE were studied, such as the multi-authority setting (MA-ABE), and po...
We present the first provably secure, practical approach to proving file replication (or other erasure coding) in distributed storage networks (DSNs). Storing multiple copies of a file FF is essential...
Digital currencies like Bitcoin and other blockchain based systems provide means to record monetary transfers between accounts. In Bitcoin like systems transactions are published on a decentralized le...
The wisdom of the crowd is a valuable asset in today's society. It is not only important in predicting elections but also plays an essentialle in marketing and the financial industry. Having a...
Multi-input functional encryption is a very useful generalization of Functional Encryption, which has been motivated by Goldwasser et al. from Eurocrypt ’14. All the constructions, however, rely on no...
We present efficient protocols for amortized secure multiparty computation with penalties and secure cash distribution, of which poker is a prime example. Our protocols have an initial phase where the...
Crowdsourcing systems have gained considerable interest and adoption in recent years. They coordinate the human intelligence of individual and businesses together from all over the world to solve comp...

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