Data security

A number of security threats are associated with cloud data services:
  not only traditional security threats, such as network eavesdropping, illegal invasion, and denial of service attacks, but also specific cloud computing threats, such as side channel attacks, virtualization vulnerabilities, and abuse of cloud services.

The following security requirements limit the threats

1)Confidentiality
    Only authorized users can access the sensitive data.
2)Access controllability
 Legal users can be authorized by the owner to access the data, while others can not access it without permissions.
3)Integrity
  Data is encrypted and decrypted