A couple of months back, when the weather was grey and it was cold (well, it still is here in Sweden, glad I did a tour to the Riviera last week), I wrote a post about how Claims encoding works in SharePoint 2010, simply called “How Claims encoding works in SharePoint 2010”. In that post I discussed how SharePoint encoded Claims from relatively long descriptive claims, containing URN’s, to a smarter and shorter format - smaller to store, faster to compare format etc.