Dynamic Id Based Remote User Authentication in Multi Server Environment Using Smart Cards: A Review

Authentication refers to the process of ensuring confidentiality of data. It basically involves verifying a user's identity for accessing a system or service. There are three ways of authentication-i)using something that a user knows eg password ii)using something that a user has eg smart card or identity card iii)using something that a user is or does for example face, finger print, voice etc. To overcome the risk of partial information leakage from static id based algorithms. Dynamic id based schemes have been proposed. In this paper, we analyzed four dynamic id based remote user password authentication schemes for multi server environment using smart card. All the schemes are vulnerable to the denial of service attack.