Mike Wright wrote: > Hi all, > > I recall a discussion that may have said RSA was not being accepted in f38 > and a different type was being preferred, possibly ecdsa? It's only old RSA1 keys which use SHA1 which are not accepted by default. RSA keys which use a SHA2 algorithm are perfectly acceptable. Though you may use ECDSA or ED25519 keys instead. > Can anybody point me to that? (date or subject would help me search) I think this is the relevant change: https://fedoraproject.org/wiki/Changes/StrongCryptoSettings3Forewarning1 > I generated an ECDSA pair. The public key seems awfully short. They don't need to be as large as an RSA key to have similar strength. Though there are reasonable concerns regarding ECDSA. Refer to the "Concerns" section of the Wikipedia page for a starting point: https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm#... Or, if you're really into diving in the weeds: https://safecurves.cr.yp.to/ ;) One possible downside to ED25519 is that it's not as widely supported. But unless you depend on some rather old systems, that's not likely a real issue.

What could be helpfull would be to tell people how to create a SHA2 signature key.... I have a ssh connexion problem after upgrading a remote machine to f38 and it is hard to find out what to do to solve the problem. I succeeded (at last!): ssh-keygen -t rsa-sha2-256 -b 4096