25.1 Introduction

The advent of cloud computing and the continuing movement toward software as a service (SaaS) paradigms have posed an increasing need for assured information sharing (AIS) as a service in the cloud. The urgency of this need was voiced in April 2011 by the National Security Agency (NSA) Chief Information Officer (CIO) Lonny Anderson in describing the agency’s focus on a “cloud-centric” approach to information sharing with other agencies [NSA11]. Likewise, the Department of Defense (DoD) has been embracing cloud computing paradigms to more efficiently, economically, flexibly, and scalably meet its vision of “delivering the power of information to ensure mission ...

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