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In a recent paper [Phys. Rev. Lett. 129, 050502 (2022)], the authors reporton the implementation of a device-independent QKD protocol with randompostselection, which was originally proposed in [Phys. Rev. Lett. 128, 110506(2022)]. Both works only provide a security proof against collective attacks,leaving open the question whether the protocol is secure against coherentattacks. In this note, we report on an attack on this protocol thatdemonstrates that coherent attacks are, in fact, stronger than collectiveattacks.

Coherent attacks are stronger than collective attacks on DIQKD with random postselection