The security device passes a yes (comparison succeeded) or no (signatures do not match) back to the processor. The device combines the digest with the secret to create its own signature, and compares it with the signature passed to it by the boot program. The boot program transmits the digest and the signature to the security device. It also reads the signature from the flash memory. On startup, the boot program calculates the digest of the operating program using the same hash algorithm. Both the program and the signature are stored in the flash, perhaps at a third party site like a subcontractor. This digest is combined with a validating secret to create the signature. At the OEM site, a hash algorithm is used to create a digest of the operating program. Secure Boot Process Secure boot procedures using an external symmetric-key security device follow this general flow: 1. This document provides a more in-depth look at the secure boot process and addresses many of the common implementation concerns.

The basic outline for implementing secure boot is provided in the document, Secure Boot Simplified. By ensuring that the operating program is authentic, the OEM can prevent unpredictable system performance, safety or regulatory violations, excess warranty costs, lost revenue, and more. Secure boot is a method of ensuring that the operating program for a system is authorized, typically by the OEM that designed and built the system. Tasking Dsp Suite v2.1 Application Note Implementing Secure Boot with the Atmel ATSHA204 Introduction Detailed Explanation Most systems that use programmable nonvolatile memory for their operating program whether it s large or small can take advantage of a secure boot process.

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