Knowledge check

The Data Encryption Standard (DES)

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

Question 1 of 10

What ultimately retired DES as a standard?

Question 2 of 10

In a Feistel network like DES, how does decryption differ from encryption?

Question 3 of 10

DES's key is stored as 64 bits, but only 56 of those bits provide security. What are the other 8 bits?

Question 4 of 10

What historical event in January 1999 concretely demonstrated DES's key-size weakness?

Question 5 of 10

Why does naive double-DES (encrypting twice with two independent 56-bit keys) NOT provide the expected 2^112 security?

Question 6 of 10

Why does real-world 3DES use three passes (encrypt-decrypt-encrypt) instead of stopping at two?

Question 7 of 10

What design element did AES deliberately abandon compared to DES?

Question 8 of 10

What was DES built on, according to its historical background?

Question 9 of 10

What is DES's block size?

Question 10 of 10

Which remaining weakness affects 3DES even after the meet-in-the-middle fix, motivating AES's full replacement of it?

0 / 10 answered