Security of Hedged Fiat-Shamir Signatures under Fault Attacks
Explore a comprehensive analysis of the security of hedged Fiat-Shamir signatures under fault attacks in this 25-minute conference talk presented at Eurocrypt 2020. Delve into the paper by Diego F. Aranha, Claudio Orlandi, Akira Takahashi, and Greg Zaverucha, which examines the vulnerabilities of deterministic randomness generation in signature schemes. Investigate various fault adversary types, including special soundness attacks and large randomness bias attacks. Learn about the proposed countermeasure of randomness hedging and its implications for signature security. Gain insights into the researchers' approach, modeling of fault attackers, and security proof overview. Discover the positive and negative results of their study, with specific focus on XEDSA and Picnic signature schemes. Enhance your understanding of cryptographic signature security and fault attack mitigation strategies in this informative presentation.