CompTIA Security+ - Cryptography and PKI

By Jordan Blake · Updated May 25, 2026

Questions23
Passing Score75%
Format52% Multiple Choice
Sessions Logged1,596
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Question catalog for this preview

Catalog listing of the 5 preview questions for this quiz.

Question 1

?? True/False (Medium)

A self-signed certificate provides the same level of trust as a CA-signed certificate.

Answer choices

  • A. True

  • B. False

Question 2

?? Multiple Choice (Easy)

What is the difference between symmetric and asymmetric encryption?

Answer choices

  • A. Symmetric uses two keys; asymmetric uses one key

  • B. Symmetric uses the same key for encryption/decryption; asymmetric uses a key pair (public/private)

  • C. Symmetric is for web traffic; asymmetric is for files

  • D. Symmetric is slower; asymmetric is faster

Question 3

?? True/False (Hard)

The process of key escrow involves storing a copy of encryption keys with a trusted third party, allowing authorized recovery if the original key is lost.

Answer choices

  • A. True

  • B. False

Question 4

?? Multiple Choice (Easy)

What does PKI stand for?

Answer choices

  • A. Private Key Infrastructure

  • B. Public Key Infrastructure

  • C. Protected Key Integration

  • D. Public Keychain Interface

Question 5

?? Multiple Choice (Hard)

Which algorithm is used in ECDSA (Elliptic Curve Digital Signature Algorithm) that makes random nonce (k) reuse catastrophic?

Answer choices

  • A. If k is reused, both the signature and plaintext are revealed

  • B. If k is reused, the private key can be mathematically recovered

  • C. If k is reused, the public key changes

  • D. If k is reused, the hash of the message is exposed