A proposed public-key quantum signature scheme based on local density matrices, claimed secure via QMA-hardness, is broken by a simple re-signing attack and an invalid security reduction.
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Public-Key Quantum Authentication and Digital Signature Schemes Based on the QMA-Complete Problem
A proposed public-key quantum signature scheme based on local density matrices, claimed secure via QMA-hardness, is broken by a simple re-signing attack and an invalid security reduction.