1
$\begingroup$

Let's suppose that two entities, A and B, are establishing a secure channel and then require a mutual authentication.

A has only a RSA key pair and B has an ECDSA key pair. Both of them trust the public key of each other.

Do you feel comfortable with having A signing it's message with RSA and B signing its message with ECDSA ?

They do have an equivalent key length for both key pairs (keylength.com)

$\endgroup$
  • $\begingroup$ What research have you done? Is this homework? $\endgroup$ – axapaxa Mar 8 '17 at 16:54
  • $\begingroup$ It is a question I am asking to myself but don't find why this can be problematic ? I've googled this and didn't find anything related to. $\endgroup$ – FdLSifu Mar 8 '17 at 16:58
2
$\begingroup$

Yes, given the following conditions:

  1. A trusts the public key of B belonging to B
  2. B trusts the public key of A belonging to A
  3. A trusts the signing algorithm ECDSA used by B
  4. B trusts the signing algorithm RSA used by A
  5. A trusts the key length of B
  6. B trusts the key length of A

Normally, the condition 3,4 use the same algorithm, but if both A and B put trust in the other's algorithm then there is no reason not to trust the authenticity.

As you said 1,2 and 5,6 are true.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

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