The present manuscript reviews trends and technologies pertaining to the future of public key infrastructure. Public key infrastructure (PKI) is one such technology that may offer benefits to net-centric organizations, being a system of services, technology, protocols and standards that can be used as a solution for providing secure transactions. Here we have reviewed some early work in the field of PKI's as well as some recent technological advance in the PKI's. We have also reviewed some issues with the traditional PKI and suggested some technological measures to overcome the limitation of conventional PKI's.