EAP-TLS with TLS 1.3
stefan.winter at restena.lu
Mon Mar 12 11:40:15 CET 2018
I'm currently looking at
It states that:
While Elliptic Curve Cryptography (ECC) was optional for earlier
version of TLS, TLS 1.3 mandates support of ECC (see Section 9 of
[I-D.ietf-tls-tls13]). To avoid fragmentation, the use of ECC in
certificates, signature algorithms, and groups are RECOMMENDED when
using EAP-TLS with TLS 1.3 or higher.
That sounds like useful avice.
I'm wondering though what to do if you have a diverse variety of client
devices doing EAP; some of which only do TLS 1.2 while others do TLS 1.3.
The EAP server can only present one certificate to its incoming peer
If it has a ECDSA certificate, there's a chance for an interop problem
with TLS 1.2 clients not supporting the needed cipher suites.
If it has a RSA certificate, it misses out on the small-cert benefits.
I wonder if it's possible to have both certificates available to the
server, with a late selection: depending on which TLS version has been
negotiated, present one cert or the other.
Is that kind of stuff doable?
It would certainly make a transition easier...
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