Quantum correlations and secret bits

It is shown that (i) all entangled states can be mapped by single-copy measurements into probability distributions containing secret correlations, and (ii) if a probability distribution obtained from $\rho_{AB}$ contains secret correlations, then $\rho_{AB}$ is entangled. These results prove the existence of a two-way connection between secret and quantum correlations in the process of preparation. They also imply that either it is possible to distill to a secret key from any bound entangled state or bipartite bound information exists.