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COMPATIBLE RESILIENT TWO SERVER PASSWORD AUTHENTICATION WITH TRADITIONAL SINGLE SERVER

The authentication systems which uses passwords to authenticate their systems stores their password in a central server which is easily prone to attack and if they are being compromised by the intruder, it is possible for the intruder to obtain the password and gain access to the contents of the user. To overcome this problem, the multi-server systems were being proposed in which the user has to communicate in parallel with several or all of the servers for the purpose of authentication. Such system requires a large communication bandwidth and needs for synchronization at the user. The system is not easy to deploy and maintain or it requires the protocols which are quite expensive. To overcome these problems the two server authentication system is being proposed which uses only the passwords and the session keys rather than performing any cryptographic techniques. The system consists of two servers, the front end service server which interacts directly to the user and the back end control server which is only visible to the service server. The users contact only the service server but these two servers are responsible for the authentication of the user. The user has a password which is transformed into two long secrets which are held by service server and control server. Both the system using their respective shares validate user during the login. The system also overcomes the online and offline dictionary attacks that are prevailing in the single and multi-server systems. The system is particularly suitable for resource-constrained users due to its efficiency in terms of both computation and communication. It is also possible for the servers to associate with multiple clients. The system is compatible with the single server systems that are available today such as FTP and web application.