With GDPR coming up ... say "Hello" to Bob, Alice and Eve ... you're going to need them!
With GDPR coming up, cryptography and its application, along with pseudo-anonymisation and incident response, are going to go to the top of the list for core knowledge for lots of professionals - not just those in cyber security - so you'd better get up to speed on Bob, Alice and Eve:
Just because a CEO has employed a Cyber Security professional to look after encryption, doesn't mean that they have no responsiblity that data has actually been encrypted properly ... in the end the board is responsible for making sure that their company complies with current regulations and laws.
Here's a quick introduction to the "nightmare" that is digital certificates:
Instead of reading through books, here's our on-line material: