In a distributed database system, the database is stored physically across computers or sites in different locations that are connected together by some form of data communication network. Distributed database security is to deal with protecting data from people or software having malicious intentions, from unauthorized access, modification and misuse of information or destruction. Most distributed systems are assembled from different components. Each of the component acts as an isolated security domain independently. In the multi sign-on environment, the end-user who wants to use services housed in different servers has to sign-on multiple times. User has to remember large numbers of passwords.