International Journal of Innovations in Scientific and Engineering Research (IJISER)
In single sign on mechanisms allow users to sign on only once and have their identities automatically verified by each application or service they want to access afterwards. There are few practical and secure single sign on models, even though it is of great importance to current distributed application environments. Most of current application architectures require the user to memorize and utilize a different set of credentials (e.g. username/password or tokens) for each application the users wants to access.