Welcome to the resource topic for 2022/1012
Title:
Nonce-Misuse Resilience of Romulus-N and GIFT-COFB
Authors: Akiko Inoue, Chun Guo, Kazuhiko Minematsu
Abstract:We analyze nonce-misuse resilience (NMRL) security of Romulus-N and GIFT-COFB, the two finalists of NIST Lightweight Cryptography project for standardizing lightweight authenticated encryption. NMRL, introduced by Ashur et al. at CRYPTO 2017, is a relaxed security notion from a stronger, nonce-misuse resistance notion. We proved that Romulus-N and GIFT-COFB have nonce-misuse resilience. For Romulus-N, we showed the perfect privacy (NMRL-PRIV) and n/2-bit authenticity (NMRL-AUTH) with graceful degradation with respect to nonce repetition. For GIFT-COFB, we showed n/4-bit security for both NMRL-PRIV and NMRL-AUTH notions.
ePrint: https://eprint.iacr.org/2022/1012
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