Cloud computing is one of the fastest developing in the internet, it provides user demanding resources and services with low cost. Users can easily use cloud resource to do their works without any interruptions like doing personal works, social networks, video editing and business works like many more. Group data sharing grabbed people attention to share their works and thoughts in cloud computing. In this concept multiple users can access same data or documents to do works for developed of

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... ects. With this concept users get lots of benefits because they can do work any where as they like with their resources because they don't need to buy new hardware or software to their works. Whenever group of people working on some important work then owner can't find malicious user in it. Its big challenge in cloud computing. Group members can share information anonymously without revealing their identity but this became big challenge in computing because when user used fake id's then it will be threat to document because they might misuse it. Dynamic changes of the group member, exploiting the key understanding and efficient get to control, the computational multifaceted nature and correspondence intricacy for refreshing the normal meeting key and the encryption information are generally low and its time taking process to share data in groups and consume high memory. Proposing user defined encryption for data sharing to secure communication. It can share the data to users in secure way and efficiently and tracing malicious user in group data sharing. It requires low amount to memory and low time to process encryption.