There is a number of block cipher modes, including ECB, CBC, CFB, OFB, CTR and others. After reading "Serious Cryptography. A Practical Introduction to Modern Encryption" by Jean-Philippe Aumasson, where the author described CFB and OFB as folklore which no one really uses, I am curious which ones are most commonly used in the real world? I think the one I come across most often would be CBC. Would anyone be able to share some stats (which I didn't manage to get to), or make and educated quess?

  • 1
    $\begingroup$ CFB is the encryption mode of by PGP/GPG, that's not exactly folklore which no one really uses. AES is very much used in CTR mode, and derivatives of that for authenticated encryption. That's not an answer, for I have no stats. $\endgroup$
    – fgrieu
    Jun 26, 2020 at 20:13
  • 1
    $\begingroup$ I would say in the future AES-GCM-SIV will be the beast. $\endgroup$
    – kelalaka
    Jun 26, 2020 at 20:30
  • 1
    $\begingroup$ AES-GCM, with indeed AES-CTR as encryption cipher is also used in TLS 1.3. Although TLS 1.2 is still very actively used (AES / CBC), I guess that CTR mode will become even more prevalent in the near future. $\endgroup$
    – Maarten Bodewes
    Jun 27, 2020 at 11:56

1 Answer 1


CTR is the most used one with some additional authentication

  • 5
    $\begingroup$ Could you please back up your answer with some references? $\endgroup$
    – ckamath
    Sep 5, 2020 at 21:30

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.