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Threshold Implementations (TI) are secure algorithmic countermeasures against side-channel attacks in the form of differential power analysis. The strength of TI lies in its minimal algorithmic requir...
Beyond Honest Majority: The Round Complexity of Fair and Robust Multi-party Computation
Fairness and Guaranteed Output Delivery MPC Round Complexity
2019/9/5
Two of the most sought-after properties of Multi-party Computation (MPC) protocols are fairness and guaranteed output delivery (GOD), the latter also referred to as robustness. Achieving both, however...
Robust and Scalable Consensus for Sharded Distributed Ledgers
Blockchain sharding randomness
2019/6/12
ByzCoin, a promising alternative of Bitcoin, is a scalable consensus protocol used as a building block of many research and enterprise-level decentralized systems. In this paper, we show that ByzCoin ...
Secret-Sharing from Robust Conditional Disclosure of Secrets
cryptographic protocols secret sharing
2019/5/21
A secret-sharing scheme is a method by which a dealer, holding a secret string, distributes shares to parties such that only authorized subsets of parties can reconstruct the secret. The collection of...
Robustness is a notion often tacitly assumed while working with encrypted data. Roughly speaking, it states that a ciphertext cannot be decrypted under different keys. Initially formalized in a public...
Towards optimal robust secret sharing with security against a rushing adversary
security against rushing adversary
2019/3/2
Robust secret sharing enables the reconstruction of a secret-shared message in the presence of up to tt (out of nn) {\em incorrect} shares. The most challenging case is when n=2t+1n=2t+1, which is the...
Computational Limitations in Robust Classification and Win-Win Results
Robust Classification Learning Parity with Noise
2019/2/28
We continue the study of statistical/computational tradeoffs in learning robust classifiers, following the recent work of Bubeck, Lee, Price and Razenshteyn who showed examples of classification tasks...
Robust MPC: Asynchronous Responsiveness yet Synchronous Security
secure multiparty computation byzantine agreement synchronous
2019/2/25
Two paradigms for secure MPC are synchronous and asynchronous protocols, which differ substantially in terms of the guarantees they provide. While synchronous protocols tolerate more corruptions and a...
Safety in Numbers: On the Need for Robust Diffie-Hellman Parameter Validation
Primality testing Miller-Rabin test Diffie-Hellman
2019/1/18
We consider the problem of constructing Diffie-Hellman (DH) parameters which pass standard approaches to parameter validation but for which the Discrete Logarithm Problem (DLP) is relatively easy to s...
Adversarially Robust Property Preserving Hash Functions
Hash function compression property-preserving
2018/12/3
Property-preserving hash functions are usually probabilistic: they use the random choice of a hash function from a family to achieve compression, and as a consequence, err on some inputs. Traditionall...
When Theory Meets Practice: A Framework for Robust Profiled Side-channel Analysis
Machine Learning Robustness Analysis Supervised Learning
2018/11/21
Profiled side-channel attacks are the most powerful attacks and they consist of two steps. The adversary first builds a leakage model, using a device similar to the target one, then it exploits this l...
Glitch-Resistant Masking Revisited - or Why Proofs in the Robust Probing Model are Needed
Side-channel analysis Masking Robust Probing Model
2018/5/28
Implementing the masking countermeasure in hardware is a delicate task. Various solutions have been proposed for this purpose over the last years: we focus on Threshold Implementations (TIs), Domain-O...
Goshawk: A Novel Efficient, Robust and Flexible Blockchain Protocol
blockchain protocol hybrid consensus scalability
2018/5/11
Proof of Work (PoW), a fundamental blockchain protocol, has been widely applied and thoroughly testified in various decentralized cryptocurrencies, due to its intriguing merits including trustworthy s...
Practical and Robust Secure Logging from Fault-Tolerant Sequential Aggregate Signatures
Sequential Aggregate Signatures Fault-Tolerance Secure Logging
2017/9/28
Keeping correct and informative log files is crucial for system maintenance, security and forensics. Cryptographic logging schemes offer integrity checks that protect a log file even in the case where...
No-Match Attacks and Robust Partnering Definitions – Defining Trivial Attacks for Security Protocols is Not Trivial
protocols definitions partnering
2017/9/1
An essential cornerstone of the definition of security for key exchange protocols is the notion of partnering. It defines when two protocol instances can be considered to have communicated with each o...