What are the main security issues when deploying a Platform as a Service (PaaS) model of cloud computing such as Windows Azure? The shared development environment presents some unique challenges, include those involving authentication, access control and authorization. Working with distributed applications and storage and data security issues are also important. This article over on the Microsoft TechNet Wiki provides an overview of some of the most important security considerations for PaaS and provides some guidance on how the role of security mechanisms in the PaaS cloud can differ from on-premise solutions. Check it out here:
http://social.technet.microsoft.com/wiki/contents/articles/3809.aspx