Transport Layer Security, or TLS, makes ecommerce and online banking possible. It protects your passwords and your privacy. Let's Encrypt transformed TLS from an expensive tool to a free one. TLS understanding and debugging is an essential sysadmin skill you must have.

TLS Mastery takes you through:

- How TLS works

- What TLS provides, and what it doesn't

- Wrapping unencrypted connections inside TLS

- Assessing TLS configurations

- The Automated Certificate Management Environment (ACME) protocol

- Using Let's Encrypt to automatically maintain TLS certificates

- Online Certificate Status Protocol

- Certificate Revocation

- CAA, HSTS, and Certificate Transparency

- Why you shouldn't run your own CA, and how to do it anyway

- and more!

Stop wandering blindly around TLS. Master the protocol with TLS Mastery!

(The Beastie and Tux editions are identical, other than cover art)