In systems that protect classified data-at-rest (DAR) using two-layer Commercial Solutions for Classified (CSfC) encryption, the terms “inner layer” and “outer layer” are used frequently, but not always clearly. While the difference may appear straightforward, confusion around terminology is common and can lead to implementation errors with real consequences, especially in operations that follow strict handling, authentication, and classification procedures.
The distinction between the inner and outer encryption layers affects how encryption is applied and removed, how devices are accessed and transported, and how systems are evaluated against government security guidance. When the layering is misunderstood or applied inconsistently, it can introduce risk, approval delays, or operational errors.
This white paper clarifies what defines the inner and outer encryption layers, and why the distinction between the two is critical in the design and integration of two-layer CSfC (DAR) storage systems.
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Steven Petric
Senior Product Manager
The Product Manager for our data storage solutions, Steven, is a data-driven professional with over 20 years of experience bringing new offerings to market and improving existing offerings. He has a Masters in Business along with Pragmatic Marketing Certification and is a Project Management Professional (PMP).
Taylor George
Product Marketing Specialist
Taylor has more than nine years of experience in the defense and aerospace industry. A native of Dayton, Ohio, the birthplace of aviation, she holds a bachelor's degree in marketing from Wright State University and specializes in secure data storage solutions.
