Background X.509 (2009) working on PMI interworking between domains Defining several new AC extensions for role mappings, attribute hierarchies etc. Needs an extension to point to the superior in a PMI delegation chain AIA is the obvious choice, and this is being used by VOMS in the grid world Last ITU-T meeting in Jeju (May 2006) issued a liaison statement to PKIX group asking if AIA can be used for ACs |