WKD proper behavior on fetch error

[Andrew Gallagher]

On 22/01/2021 17:29, Daniel Kahn Gillmor via Gnupg-users wrote:
> this is a non-backward-compatible change to the format, so i think
> that's probably not a great outcome.

I can't help thinking that length fingerprinting and padding oracles are
a general concern, and therefore more appropriately solved at a lower
layer of the network stack.

A

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