(In)security of stream ciphers against quantum annealing attacks on the example of the Grain 128 and Grain 128a ciphers

ePrint Report: (In)security of stream ciphers against quantum annealing attacks on the example of the Grain 128 and Grain 128a ciphers

Michał Wroński, Elżbieta Burek, Mateusz Leśniak

The security level of a cipher is a key parameter. While general-purpose quantum computers significantly threaten modern symmetric ciphers, other quantum approaches like quantum annealing have been less concerning. However, this paper argues that a quantum annealer specifically designed to attack Grain 128 and Grain 128a ciphers could soon be technologically feasible. Such …

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