This document is a technical report detailing an architectural review conducted by NCC Group on the AWS Nitro System, focusing on the security claims made by AWS regarding its APIs. The assessment was initiated in late 2022 and continued into early 2023, aiming to evaluate the design and security measures of the Nitro System. Key components of the Nitro System include purpose-built Nitro Cards, a Nitro Security Chip, and a Nitro Hypervisor, all contributing to enhanced security and customer privacy. The report outlines the methodology used for the assessment, which involved interviews with AWS engineers and a review of internal documentation. The evaluation confirmed that the Nitro System's design effectively prevents unauthorized access to customer data, aligning with AWS's security goals. The report also notes that the assessment does not provide guarantees against future security threats and is based on the system's design as presented during the review period.