Key Discovery Note

Virginie, Harry,

We published <https://www.w3.org/TR/webcrypto-key-discovery/> the Key
Discovery document as a WG Note in March, but it needs an update to
correctly refer to the CryptoKey object instead of the old Key object.

An ED for the update is here
<https://w3c.github.io/webcrypto/KeyDiscovery.html>.

I can produce the WG Note version for publication if you let me know the
publication date.

...Mark