NIST Special Publication 800-144 - Guidelines on Security and Privacy in Public Cloud Computing

The  purpose  of  this  document  is  to  provide  an  overview  of  public  cloud  computing  and  the security and privacy challenges involved.  The document discusses the threats, technology risks, and safeguards for public cloud environments, and provides the insight needed to make informed information  technology  decisions  on  their  treatment. 
The document does not prescribe  or recommend  any  specific cloud  computing service, service  arrangement, service agreement, service provider, or deployment model. 
Each organization must perform its own analysis of its needs, and assess, select, engage, and oversee the public cloud services that can best fulfil those needs.