Apparati, methods, and computer readable media for authenticating an entity (9) in a shared hosting computer network (4) environment. A service provider computer (2) contains a plurality of entity sites (5). Connected to the service provider computer (2), a trusted third party computer (1) is adapted to provide a conglomerated authenticity certification to the service provider computer (2). Coupled to the trusted third party computer (1) is a means (10) for enabling an entity (9) to seek to convert the conglomerated authenticity certification into an individualized authenticity certification covering that entity's site (5).