Sharing-based Privacy and Availability of Cloud Data Warehouses

National audienceCloud computing can help reduce costs, increase business agility and deploy applications with a high return on investment such as data warehouses. However, storing and managing data in the cloud may not be fully trustworthy. In this article, we focus on both data security (data privacy, availability and integrity) and data analysis in the cloud. To solve the data security issue, we propose a new (m,n,t) multi secret sharing scheme based on block cryptography, secret sharing and hash functions. Moreover, we apply this solution onto a cloud data warehouse such that data security and data analysis are addressed. An extensive security and performance analysis shows that the proposed schemes can prevent most attacks, guarantee data availability and integrity, and allow analyzing data at low costs (data storage, data transfer and time computation) in the pay-as-you-go economic model in the cloud