This book constitutes the refereed proceedings of the Second International Conference on Trust and Privacy in Digital Business, TrustBus 2005, held in Copenhagen, Denmark, in August 2005.The 32 revised full papers presented together with an invited paper were carefully reviewed and selected from more than 100 submissions. The papers are organized in topical sections on digital business, mobile/wireless services, certificate revocation/index search, trust, digital signature, privacy, e-auctions, and smart cards/authentication.