Indeed. Interesting mix of theory ("here's how RSA works and why") and practice (list of specs and RFCs), but very old-school. Today, I'd expect less focus on

Indeed. Interesting mix of theory ("here's how RSA works and why") and practice (list of specs and RFCs), but very old-school. Today, I'd expect less focus on RSA and PGP, and instead a mention of elliptic curves, the Signal protocol (double ratchet), etc.