Encryption quiz

Test your Encryption knowledge with a free interactive quiz — 34 questions with answers and explanations. No signup needed to play.

What happens if the same 96-bit GCM nonce is reused with the same AES key for two different messages?

1. What happens if the same 96-bit GCM nonce is reused with the same AES key for two different messages?
2. Why is a fast general-purpose hash like plain SHA-256 a poor choice for hashing passwords?
3. What is the fundamental difference between an HMAC and a digital signature as integrity mechanisms?
4. What is the main practical problem symmetric encryption alone does not solve?
5. How does code signing (e.g. signing a software release) protect end users?
6. A well-known illustration of ECB mode's weakness is:
7. What is "envelope encryption," a common pattern for encrypting large amounts of application data?
8. A HMAC (Hash-based Message Authentication Code) combines a hash function with:
9. What is the key distinction between hashing and encryption?
10. Why does modern TLS increasingly prefer ECDHE (elliptic-curve Diffie-Hellman) key exchange over RSA key exchange?
11. Why do production systems typically use a dedicated KMS (Key Management Service) instead of storing raw encryption keys in application config files?
12. AES is described as a "block cipher." What does that mean?

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