We consider the following problem: a user U wants to store his files in an encrypted form on
a remote file server S. Later the user U wants to efficiently retrieve some of the encrypted …

The internet is a ubiquitous technology that has changed conventional human interactions.
In our present time, it is not unusual for financial transactions to take place virtually with …

In last years, there has been an increasing effort to leverage distributed ledger technology
(DLT), including blockchain. One of the main topics of interest, given its importance, is the …

In mining and integrating data from multiple sources, there are many privacy and security
issues. In several different contexts, the security of the full privacy-preserving data mining …

We propose a one-round 1-out-of-n computationally-private information retrieval protocol for
ℓ-bit strings with low-degree polylogarithmic receiver-computation, linear sender …

We proposed a two-round protocol for solving the Millionaires' Problem in the setting of semi-
honest parties. Our protocol uses either multiplicative or additive homomorphic encryptions …

We propose a generalization of Paillier's probabilistic public-key system, in which the
expansion factor is reduced and which allows to adjust the block length of the scheme even …

The Bitcoin payment system involves two agent types: users that transact with the currency
and pay fees and miners in charge of authorizing transactions and securing the system in …

Chameleon signatures are non-interactive signatures based on a hash-and-sign paradigm,
and similar in efficiency to regular signatures. The distinguishing characteristic of chameleon …

We introduce a lattice-based group signature scheme that provides several noticeable
improvements over the contemporary ones: simpler construction, weaker hardness …