Scientific Online Publishing (SOP)
In this technical era of computing, one of the most important words used is 'Cloud computing'. It is growing day-by-day due to its rich features of services. Cloud computing uses Internet and central remote servers to maintain data and applications. The data in the cloud are stored in off premises as encrypted form. One of the most popular ways is selectively retrieve files through keyword-based search instead of retrieving all the encrypted files back. There are so many challenges in cloud computing.