A polynomial-query classical eavesdropper recovers the shared key with certainty in every perfectly complete many-round QCCC key agreement protocol relative to a quantum-accessible random oracle.
How (not) to build quantum PKE in Minicrypt
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Impossibility of Perfectly Complete Many-Round Key Agreement in the QROM
A polynomial-query classical eavesdropper recovers the shared key with certainty in every perfectly complete many-round QCCC key agreement protocol relative to a quantum-accessible random oracle.