> We'd like to start a short working group last call on the changes made 
in response to the previous last call.  It will end June 
> 28th, 2017, any time zone (to accommodate any changes needed before the 
draft deadline the following Monday).

There is this sentence in the security considerations (10.2 Integrity of 
Authorizations) that strikes me as extremely misleading:

"All of the challenges above have a binding between the account private 
key and the validation query made by the server, via the key 
authorization.  The key authorization is signed by the account private 
key, reflects the corresponding public key, and is provided to the server 
in the validation response."

The key authorization itself does NOT contain the signature of the 
account's key. It gets though signed by the account's key later on in the 
challenge response (not the validation response) over the ACME channel 
(not the validation channel). What about saying that in the chronological 
order of events:

"The key authorization reflects the account public key, is provided to the 
server in the validation response over the validation channel and signed 
afterwards by the corresponding private key in the challenge response over 
the ACME channel"

Best regards,
Marcos

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