This is a terrible analogy. In cryptography, once any SINGLE person in the world has compromised a signing key, EVERY person in the world can use it. Thus for

This is a terrible analogy. In cryptography, once any SINGLE person in the world has compromised a signing key, EVERY person in the world can use it. Thus for a prisoner analogy, its equivalent to say once any SINGLE prisoner escapes, EVERY prisoner has the ability to escape. So yes, in this terrible analogy it means all prisoners are free.