Quantum Cryptanalysis of OTR and OPP: Attacks on Confidentiality, and Key-Recovery

ePrint Report: Quantum Cryptanalysis of OTR and OPP: Attacks on Confidentiality, and Key-Recovery

Melanie Jauch, Varun Maram

In this paper, we analyze the security of authenticated encryption modes OTR (Minematsu, Eurocrypt 2014) and OPP (Granger, Jovanovic, Mennink, and Neves, Eurocrypt 2016) in a setting where an adversary is allowed to make encryption queries in quantum superposition. Starting with OTR -- or more technically, AES-OTR, a third-round CAESAR candidate -- we extend prior quantum attacks on the mode's unforgeability in the …

adversary attacks confidentiality cryptanalysis encryption eprint report eurocrypt key quantum recovery report security