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The laws of physics play a crucial role in the security of quantum keydistribution (QKD). This fact has often been misunderstood as if the securityof QKD would be based only on the laws of physics. As the experts know well,things are more subtle. We review the progresses in practical QKD focusing on(I) the elements of trust that are common to classical and quantumimplementations of key distribution; and (II) some threats to security thathave been highlighted recently, none of which is unredeemable (i.e., inprinciple QKD can be made secure). This leads us to guess that the field,similar to non-quantum modern cryptography, is going to split in twodirections: those who pursue practical devices may have to moderate theirsecurity claims; those who pursue ultimate security may have to suspend theirclaims of usefulness.

The black paper of quantum cryptography: real implementation problems