Knowledge check

Entropy: measuring, estimating, and testing true randomness

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

Question 1 of 10

Why does cryptography care about min-entropy rather than just Shannon entropy?

Question 2 of 10

A biased coin lands heads 90% of the time. Which is true?

Question 3 of 10

What does NIST SP 800-90B actually define?

Question 4 of 10

How does SP 800-90B combine the results of multiple entropy estimators into one final assessed value?

Question 5 of 10

Which three NIST SP 800-90B non-IID estimators does this site's Entropy Testing Playground tool implement?

Question 6 of 10

What fundamentally distinguishes a true random number generator (TRNG) from a CSPRNG?

Question 7 of 10

Why is raw TRNG output typically run through a whitening/conditioning step like a von Neumann extractor before use?

Question 8 of 10

What changed with Linux's getrandom() syscall (since Linux 3.17), compared to the old /dev/random vs. /dev/urandom split?

Question 9 of 10

What was the common thread behind the 2012 'Mining Your Ps and Qs' finding of millions of shared RSA/DSA keys across network devices?

Question 10 of 10

A 6-word Diceware passphrase is drawn uniformly from the standard 7,776-word list. Roughly how is its entropy calculated?

0 / 10 answered