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

Reader Rena on 2015-12-13 at 03:31:

I feel like I'm missing something here. An attacker can craft a private key P and a message M, such that the signature of M signed with P is the same as the signature of some other message signed with some other private key? But what good does this do them? The signature of that other message won't be correct for their new message?

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