Skip to Content [alt-c]


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?


Post a Reply

Your comment will be public. If you would like to contact me privately, please email me. Please keep your comment on-topic, polite, and comprehensible.

(Optional; will be published)

(Optional; will not be published)

(Optional; will be published)

  • Blank lines separate paragraphs.
  • Lines starting with ">" are indented as block quotes.
  • Lines starting with two spaces are reproduced verbatim.
  • Text surrounded by *asterisks* is italicized.
  • Text surrounded by `back ticks` is monospaced.
  • URLs are turned into links.
  • Use the Preview button to check your formatting.