ITSSAKA-MS: An Improved Three-Factor Symmetric-Key Based Secure AKA Scheme for Multi-Server Environments
A variety of three-factor smart-card based schemes, specifically designed for telecare medicine information systems (TMIS) are available for remote user authentication.Most of the existing schemes for TMIS are customarily proposed for the single server-based environments and in a single-server environment.Therefore, there is a need for patients to