Post-Quantum Security of the (Tweakable) FX Construction, and Applications

ePrint Report: Post-Quantum Security of the (Tweakable) FX Construction, and Applications

Gorjan Alagic, Chen Bai, Jonathan Katz, Christian Majenz, Patrick Struck

The FX construction provides a way to increase the effective key length of a block cipher E. We prove security of a tweakable version of the FX construction in the post-quantum setting, i.e., against a quantum attacker given only classical access to the secretly keyed construction while retaining quantum access to E, a setting that seems to be the …

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