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dkim clarification



Is it reasonably accurate (at a simple level) to say that dkim involves applying a digital signature to an email by the domain (as opposed to a digital signature applied by the user / sender of an email)?

 

And that the domain uses the private key of a public / private keypair?

 

E.g., if <user>@<domain>.com sends an email, <domain>.com applies a digital signature to it?

 

And then, in the DNS system entry for <domain>.com, among other things, the public key is stored?

 

(Extra points for anybody who can craft a somewhat similar simple explanation of DMARC.)

 

--

rhk

 

<long sig elided>


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