I hear good things about Bulletproof SSL/TLS by Ivan Ristić: https://www.feistyduck.com/books/bulletproof-ssl-and-tls/ https://www.feistyduck.com/books/bulletp

I hear good things about Bulletproof SSL/TLS by Ivan Ristić: https://www.feistyduck.com/books/bulletproof-ssl-and-tls/ https://www.feistyduck.com/books/bulletproof-ssl-and-tls/ There was also a nice web page presenting all kinds of PKI concepts that I came across a few years ago but haven't been able to find since then. :-(