The Security+ exam expects you to understand some cryptography topics.
As an example, you should have a basic understanding of a certificate signing request (CSR) and a certificate authority (CA). See if you can answer this sample question?
Q. You need to submit a CSR to a CA. Which of the following would you do FIRST?
A. Generate a new RSA-based session key.
B. Generate a new RSA-based private key.
C. Generate the CRL.
D. Implement OCSP.
More, do you know why the correct answer is correct and the incorrect answers are incorrect? The answer and explanation is available here.