... security and flexibility. Data sharing is one of the major issues of distributed computing. Actually distributed means branches of computers connected through wires or wireless mechanism. In distributed environment distribution of data can be done in such a way that while querying data, request can be sent on more then one computer from any data access point. Mobile computing is another hot issue in the field of computer sciences. From this not only our mind became free from spaghettis of wires but also it made our world a global village. Security remained a main issue while creating any distributed system. Information leakage threat increases when computer send or receive any request or data from other computer. There are different techniques discussed later to make the environment secure. The availability of wireless network connections to laptop computers and PDA's has created interest in the issues surrounding mobile computing. However, enabling users ...

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