Method for distributing keys among a number of secure devices, method for communicating with a number of secure devices, security system, and set of secure devices

摘要

In a method for distributing keys among a number of secure devices, the secure devices are divided into sets (A,B,C,D,E), each set having a plurality of subsets (a,b,c,d,e). Each subset comprises two or more secure devices having the same key which is unique for this subset. Each secure device is a member of a number of sets (A,B,C,D,E) such that two or more secure devices which are a member of a subset, are not a member of the same subset in another set.