Providing privacy preserving in cloud computing

People can only enjoy the full benefits of Cloud computing if we can address the very real privacy and security concerns that come along with storing sensitive personal information in databases and software scattered around the Internet. There are many service provider in the internet, we can call each service as a cloud, each cloud service will exchange data with other cloud, so when the data is exchanged between the clouds, there exist the problem of disclosure of privacy. So the privacy disclosure problem about individual or company is inevitably exposed when releasing or sharing data in the cloud service. Privacy is an important issue for cloud computing, both in terms of legal compliance and user trust, and needs to be considered at every phase of design. Our paper provides some privacy preserving technologies used in cloud computing services.