eID cards and electronic authentication known as E-authentication are becoming more and more popular at Government and Business institutions for recent years and both concepts will continue to remain important for the next decade. Especially in Europe, almost all of the countries have an eID project and the level of the progress varies based on the countries. The citizens have gained great benefits from those e-Government Applications in terms of easy use of the services, and rapid return of the results. But there is a big issue from the service provider point of view. Since the resource which is shared by the service requester is very big and the eligibility of the requester is not easy to identify in electronic environments. The main necessity of the entire e- Government and e-Business system is to provide a common electronic authentication system that guaranties the eligibility of the service requester (citizen) of a service in an electronic environment is the right person. After stating the principles of Authentication, we introduce Turkish eID card and Electronic Authentication, System (EAS) respectively. We share the experiences that we have obtained during the pilot application of the projects. We discuss the abilities of reducing the bureaucracy in business services via the support of eID card and EAS. As a future work, we identify the requirements for a Turkish eID Integration Center for eID integration with e- Government and e-Business applications