Knowledge check

Symmetric-key cryptography & AES

10 questions testing what you just read — no login, no tracking, just immediate feedback.

Question 1 of 10

How many rounds does AES-256 use?

Question 2 of 10

What is the AES "state"?

Question 3 of 10

Which AES mode provides both confidentiality and integrity in a single pass?

Question 4 of 10

Why is AES roughly 100–1000x faster than public-key operations on the same data?

Question 5 of 10

What is the "avalanche effect" in AES?

Question 6 of 10

What specifically does the ShiftRows step do?

Question 7 of 10

What kind of arithmetic does MixColumns use to blend a column's four bytes together?

Question 8 of 10

Why is ECB mode unsafe, even though each block is properly encrypted with AES?

Question 9 of 10

What makes CTR mode parallelizable in a way CBC mode is not?

Question 10 of 10

What happens if a nonce is ever reused with the same key in AES-GCM?

0 / 10 answered