In recent years, cloud computing is not only a technical issue but also a popular commercial issue. It supplies services as well as resources through the Internet. Though cloud computing brings a lot of convenience, some people have doubt about its security.
This study focuses on data and accounts protection on the cloud. We proposed security mechanisms to improve confidentiality, integrity, authentication, access control and audit in the cloud. The proposed security mechanisms are divided into two parts. The first part is for security of data storage, which combines the concept of RAID 5 with secret sharing. The second part is for account protection, which stores two time dimensions to make use of bitemporal databases.
Before being uploaded, data are split using of the first part mechanisms. Even if someone steals some data, he couldn’t read and use them. The first part mechanisms will achieve confidentiality and integrity.
When consumers perform some actions on cloud bitemporal databases, corresponding transaction times will be recorded and checked with their valid times. Thus we can audit consumers’ transactions. Herewith the second part mechanisms will achieve authentication, access control and auditing. Therefore, the security mechanisms can secure data and protect accounts.
