How to build your own public key infrastructure

The text discusses the importance of protecting data as it travels between datacenters and how Cloudflare has built its own Public Key Infrastructure (PKI) to ensure secure communication between internal services. It explains that a strong PKI is crucial for securing distributed systems architectures, and provides detailed instructions on how to build an internal CA using CFSSL, an open source PKI toolkit developed by Cloudflare. The text also covers the process of issuing certificates and keys for applications, as well as how to establish trust across services with mutually authenticated TLS. Additionally, it mentions that Cloudflare's internal PKI can be used to issue certificates to third parties who are integrating with their network.