3Sims K. IBM introduces ready-to-use cloud computing collaboration services get clients started with cloud computing, http://www.ibm.com/press/us/en/pressrelease/22613.wss,2007.
5John Rittinghouse, James Ransome. Cloud computing:implementation,management,and security,March 2009.
6Heiser J,Nicolett M. Assessing the security risks of cloud computing, http://www.gartner. Om/DisplayDocument? id = 685308, 2008.
7HALLAM-BAKER P. XML key management specification (XKMS 2.0). W3C working draft [ D/OL]. (2005). http://www, w3. org/ TR/2005/REC-x kms2-20050628/.
8ARCHER J. Security guidance for critical areas of focus in cloud com- puting v2. 1. cloud security alliance [ EB/OL]. (2009). http:// www. eloudsecurityalliance, org/guidance.
