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Omniring: Scaling Up Private Payments Without Trusted Setup - Formal Foundations and Constructions of Ring Confidential Transactions with Log-size Proofs
Ring Confidential Transactions Log-size Proofs
2019/5/31
Monero is the largest cryptocurrency with built-in cryptographic privacy features. The transactions are authenticated using spend proofs, which provide a certain level of anonymity by hiding the sourc...
One of the main challenges that hinder further adaption of decentralized cryptocurrencies is scalability. Because current cryptocurrencies require that all transactions are processed and stored on a d...
Onion-AE: Foundations of Nested Encryption
Anonymity authenticated encryption onion routing
2018/2/6
Nested symmetric encryption is a well-known technique for low-latency communication privacy. But just what problem does this technique aim to solve? In answer, we provide a provable-security treatment...
Foundations of Homomorphic Secret Sharing
homomorphic secret sharing, secure computation, communication complexity
2018/1/2
Homomorphic secret sharing (HSS) is the secret sharing analogue of homomorphic encryption. An HSS scheme supports a local evaluation of functions on shares of one or more secret inputs, such that the ...
Privacy Notions for Privacy-Preserving Distributed Data Mining: Foundations and Privacy Games
privacy privacy games privacy notions
2017/11/27
It is well understood that the huge volumes of data captured in recent years have the potential to underpin significant research developments in many fields. But, to realise these benefits, all releva...
It is well-known that a program's memory access pattern can leak information about its input. To thwart such leakage, most existing works adopt the solution of oblivious RAM (ORAM) simulation. Such a ...
Foundations for Actively Secure Card-based Cryptography
Card-based protocols Card shuffling Secure multiparty computation
2017/5/23
Starting with the so-called “Five-Card Trick” of den Boer (EUROCRYPT 1989) for computing the AND of two players' bits, a version of secure multiparty computation in which a deck of playing cards repla...
Automatically Detecting the Misuse of Secrets: Foundations, Design Principles, and Applications
cryptographic protocols Design Principles
2017/3/13
We develop foundations and several constructions for security protocols that can automatically detect, without false positives, if a secret (such as a key or password) has been misused. Such construct...
Multi-Prover Interactive Proofs: Unsound Foundations
cryptographic protocols Zero-Knowledge
2017/3/9
Several Multi-Prover Interactive Proofs (MIPs) found in the literature contain proofs of soundness that are lacking. This was first observed by Crépeau, Salvail, Simard and Tapp who defined a notion o...
Group signatures are a central cryptographic primitive that
has received a considerable amount of attention from the cryptographic
community. They allow members of a group to anonymously sign on beh...
Semantically Secure Anonymity: Foundations of Re-encryption
probabilistic re-encryption key anonymity anonymous communication
2016/4/6
The notion of universal re-encryption is an established primitive used in the design of many anonymity protocols. It allows anyone to randomize a ciphertext without changing its size, without decrypti...
Foundations of Hardware-Based Attested Computation and Application to SGX
isolated execution environments trusted hardware attestation
2016/1/27
Exciting new capabilities of modern trusted hardware technologies allow for the execution
of arbitrary code within environments completely isolated from the rest of the
system and provide cryptograp...
Foundations of Reconfigurable PUFs
Physically Unclonable Functions Logically Reconfigurable Tamper-resistance
2015/12/31
A Physically Unclonable Function (PUF) can be seen as a
source of randomness that can be challenged with a stimulus and responds
in a way that is to some extent unpredictable. PUFs can be used to pr...
Garbled circuits is a cryptographic technique, which has been used among other things for the construction
of two and three-party secure computation, private function evaluation and secure outsourcin...
On the Foundations of Physical Unclonable Functions
Physical Unclonable Functions PUF Strong t-PUFs
2009/6/15
We investigate the foundations of Physical Unclonable Functions from several perspectives.
Firstly, we discuss formal and conceptual issues in the various current definitions of PUFs. As
we argue, t...