Patent ID: 8209531

Claim:
A computer implemented method for generating a system of sets {F}, each set F being a set of one or more digital certificates DC and/or digital certificate slots assignable to digital certificates, each digital certificate DC=DC(CK, EN) certifying that a corresponding cryptographic key CK is associated with an entity EN associated with a computer system, wherein the system of sets {F} is generated taking into account one or more groups of said computer systems, each group being a multicasting group or a possible multicasting group, the method comprising: (1) for at least one said multicasting group, generating, using a computer operation, a set Fε{F} comprising at least two digital certificates DC(CK, EN) whose associated entities EN have their associated computer systems belonging to said at least one multicasting group; (2) generating, using a computer operation, data defining a validity proof for the set F.