>No crypto-system is truly secure unless BOTH sides can be trusted. If either one is even remotely possible to compromise, then that will happen. Depends on wh

>No crypto-system is truly secure unless BOTH sides can be trusted. If either one is even remotely possible to compromise, then that will happen. Depends on what you want to keep secret and mean by secure. Homomorphic encryption (http://en.wikipedia.org/wiki/Homomorphic_computing http://en.wikipedia.org/wiki/Homomorphic_computing) schemes work even when an end-point is untrusted. For example a game of mental poker (http://en.wikipedia.org/wiki/Mental_poker http://en.wikipedia.org/wiki/Mental_poker) each party/end-point is untrusted by it may still be a "secure" system. Or consider "secure" to mean that your identity remains private if you so wish. One could certainly create a crypto system that binds an actor to an act without any end-points learning the identity of the actor, but still allowing the actor to take credit if they so wish.