2
$\begingroup$

What is the exact difference between the key update and re-keying? Following the discussions here, I understood that the key update is the process of deriving the new session key from old key. In the case of re-keying, the new key is independent of old key. My questions are as follows:

  1. Can key-update protect future messages from a compromise of an old key in any way? Is the re-keying only solution to achieve this?

  2. In the case of re-keying, is it always necessary to perform the authentication process between communicating entities prior to every re-keying, especially when sensing devices are deployed in a hostile environment? If not, how communicating devices will trust each other?

  3. If I am using ECC based key establishment protocol with a pre-shared master key for resisting the meet-in-the-middle attack, what are the possible options for the key update on resource constrained devices?

$\endgroup$

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.