[openpgp] Re: Encryption subkey selection

Andrew Gallagher <[email protected]>
Newsgroups gmane.ietf.openpgp
Message-ID <[email protected]>
On 7 Apr 2025, at 11:13, Falko Strenzke <[email protected]> wrote:
> In case of b) it doesn't seem to matter that much if we assign implicit rank 0 to keys or keep them outside the ESS selection algorithm altogether. I would tend to say in case the ESS selection fails, the sender should be be able to pick any set of encryption subkeys – whether they have an associated ESS or not.
> 

In the case where a fallback cert exists, and no usable set of ranked subkeys can be found on the preferred cert, should a receiving implementation try the fallback cert's subkeys before or after reverting to “any reasonable method” on the preferred cert?

A

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