Proving security at scale with automated reasoning

It provides the highest level of assurance possible for critical security characteristics of the cloud, such as access control policies or network exposure of Amazon Elastic Compute Cloud (Amazon EC2) instances. Automated reasoning is used to provide higher levels of security assurance for core AWS code used by our internal teams, as well as in tools that are customer accessible across a variety of AWS security services. Zelkova does this by using automated reasoning to analyze policies, such as those used for AWS Identity and Access Management (IAM) and Amazon Simple Storage Service (Amazon S3).

Source: www.allthingsdistributed.com