Pirate Evolution

Abstract

In Chapter 4 we put forth the notion of winnable revocation games. Winning a sequence of such games implies that the adversary can be eventually disabled by the tracer. Nevertheless, the fact that the adversary can be disabled does not necessarily imply that a certain leaking incident, i.e., an incident where some key material of some users are exposed to the adversary, can be simultaneously contained. This is due to the fact that a leaking incident enables possibly the creation of a sequence of adversaries that may have to be successively revoked (in a succession of many revocation games). This gives rise to the notion of an evolving adversary which is the subject of this chapter.