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In reply to Duplicate Signature Key Selection Attack in Let's Encrypt

Reader Eivind on 2015-12-04 at 07:18:

Thank you, that was a very informative explanation.

BTW, can't Mallory (e.g. NSA++) inject fake DNS responses (QUANTUMLEAP, or whatever it is called) to the ACME server to falsely "prove" it is the owner of Bob's domain, and then get certificates for his domain? Is dns txt records as authentication good enough?

(typing on cell phone, so painful aitocorrect)

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