Mark Delany wrote:
5. If the customer trusts you, they might supply a private key to
match a Selector so that you can sign the submissions on their
behalf.
It's easier than that. The customer merely needs to put a public
key that the esp's signer is using already into their selector,
and then the esp can sign as the customer's domain. This is yet
another manifestation of the "outsourced business" functionality.
Mike
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