Insecurity of position-based quantum-cryptography protocols against entanglement attacks
Insecurity of position-based quantum-cryptography protocols against entanglement attacks
Recently, position-based quantum cryptography has been claimed to be unconditionally secure. On the contrary, here we show that the existing proposals for position-based quantum cryptography are, in fact, insecure if entanglement is shared among two adversaries. Specifically, we demonstrate how the adversaries can incorporate ideas of quantum teleportation and quantum …