The smart card based authentication schemes are designed and developed toensure secure and authorized communication between remote user and the server.In recent times, many smart card based authentication schemes for the telecaremedical information systems (TMIS) have been presented. In this article, webriefly discuss some of the recently published smart card based authenticationschemes for TMIS and try to show why efficient login and password change phasesare required. In other word, the study demonstrates how inefficient passwordchange phase leads to denial of server attack and how inefficient login phaseincrease the communication and computation overhead and decrease theperformance of the system.
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