I recommend Security without Obscurity: A Guide to PKI Operations by W. Clay Epstein and Bulletproof TLS and PKI by Ivan Ristić. I started working in this spac

I recommend Security without Obscurity: A Guide to PKI Operations by W. Clay Epstein and Bulletproof TLS and PKI by Ivan Ristić. I started working in this space a year ago (I'm on a project deploying zero trust networking at a large company) and these books have been invaluable. https://www.amazon.com/gp/product/036765864X https://www.amazon.com/gp/product/036765864X https://www.feistyduck.com/books/bulletproof-tls-and-pki/ https://www.feistyduck.com/books/bulletproof-tls-and-pki/