At the end of the previous chapter, we introduced the concept of a threat model. A threat model is an analysis of the security of the system that identifies assets, threats, vulnerabilities, and risks. Like any model, the depth of the analysis can vary. In the upcoming section, we'll present a cursory analysis so that you can start thinking about this process. This analysis will also help us understand the capabilities and limitations of our project.
The first step of our analysis is to clearly provide a description of the system we are trying to protect. In this project, we'll build a logical GPG co-processor using the BBB and the CryptoCape. We'll store the GPG keys on the BBB and then connect to the BBB over Secure Shell (SSH) to use the keys and to run GPG. The CryptoCape will be used to encrypt your GPG key when not in use, known as at rest. We'll add a keypad to collect a numeric code, which will be provided to the TPM. This...