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On Security of Fiat-Shamir Signatures over Lattice in the Presence of Randomness Leakage
Randomness leakage attacks Fiat-Shamir signature Dilithium
2019/6/19
Leakage during the signing process, including partial key exposure and partial (or complete) randomness leakage, may be devastating for the security of digital signatures. In this work, we consider th...
Testing the Randomness of Cryptographic Function Mappings
Statistical tests Bayesian model selection AES block cipher
2019/1/29
A cryptographic function with a fixed-length output, such as a block cipher, hash function, or message authentication code (MAC), should behave as a random mapping. The mapping's randomness can be eva...
Improved Security Evaluation Techniques for Imperfect Randomness from Arbitrary Distributions
security evaluation Renyi divergence square-friendly
2019/1/26
Dodis and Yu (TCC 2013) studied how the security of cryptographic primitives that are secure in the "ideal" model in which the distribution of a randomness is the uniform distribution, is degraded whe...
Uncontrolled Randomness in Blockchains: Covert Bulletin Board for Illicit Activities
Blockchain Steganography Covert Broadcast Channels
2018/12/11
The blockchain technology represents a new paradigm to realize persistent distributed ledgers globally. While the blockchain technology is promising in a great number of fields, it can be abused to c...
A Note on Transitional Leakage When Masking AES with Only Two Bits of Randomness
side-channel probing model transitional leakage
2018/11/21
Recently, Gross et al. demonstrated a first-order probing-secure implementation of AES using only two bits of randomness for both the initial sharing and the entire computation of AES. In this note, w...
Secure Modulo Zero-Sum Randomness as Cryptographic Resource
cryptographic resource public channel multi-party secure computation
2018/11/20
We propose a new cryptographic resource, which we call modulo zero-sum randomness, for several cryptographic tasks. The modulo zero-sum randomness X1,…,XmX1,…,Xm is distributed randomness among mm par...
Guards in Action: First-Order SCA Secure Implementations of Ketje without Additional Randomness
Authenticated Encryption KETJE SHA-3
2018/11/19
Recently the CAESAR competition has announced several finalists among the submitted authenticated encryption algorithms, after an open selection process during the last 5 years. Applications using the...
Low Randomness Masking and Shuffling: An Evaluation Using Mutual Information
masking shuffling RNG
2018/11/19
Side-channel countermeasure designers often face severe performance overheads when trying to protect a device. Widely applied countermeasures such as masking and shuffling entail generating a large am...
Shuffle and Mix: On the Diffusion of Randomness in Threshold Implementations of Keccak
side-channel analysis threshold implementation uniformity
2018/11/13
Threshold Implementations are well-known as a provably firstorder secure Boolean masking scheme even in the presence of glitches. A precondition for their security proof is a uniform input distributio...
Secure Certification of Mixed Quantum States with Application to Two-Party Randomness Generation
quantum cryptography Mixed Quantum States
2018/11/8
We investigate sampling procedures that certify that an arbitrary quantum state on nn subsystems is close to an ideal mixed state φ⊗nφ⊗n for a given reference state φφ, up to errors on a f...
Security Analysis for Randomness Improvements for Security Protocols
cryptographic protocols Security Protocols
2018/11/2
Many cryptographic mechanisms depend on the availability of secure random numbers. In practice, the sources of random numbers can be unreliable for many reasons. There exist ways to improve the reliab...
Randomness analysis for multiple-recursive matrix generator
Linear feedback shift register stream cipher randomness
2018/6/19
Randomness testing of binary sequences generated by any keystream generator is of paramount importance to both designer and attacker. Here we consider a word-oriented keystream generator known as mult...
A Note on the Communication Complexity of Multiparty Computation in the Correlated Randomness Model
multiparty computation correlated randomness model information- theoretic security
2018/5/22
Secure multiparty computation (MPC) addresses the challenge of evaluating functions on secret inputs without compromising their privacy. An central question in multiparty communication is to understan...
HydRand: Practical Continuous Distributed Randomness
distributed randomness Byzantine agreement
2018/4/9
A reliable source of randomness is not only an essential building block in various cryptographic, security, and distributed systems protocols, but also plays an integral part in the design of many new...
A First-Order SCA Resistant AES without Fresh Randomness
side-channel analysis threshold implementation randomness
2018/3/6
Since the advent of Differential Power Analysis (DPA) in the late 1990s protecting embedded devices against Side-Channel Analysis (SCA) attacks has been a major research effort. Even though many diffe...