SHA1 collisions proven possisble

valdis.kletnieks at valdis.kletnieks at
Mon Feb 27 09:14:38 UTC 2017

On Mon, 27 Feb 2017 01:15:28 -0500, "Patrick W. Gilmore" said:

> In the example above, the CA knows the SHA-1 hash of the cert it issued. (We
> are assuming there is a CA which still does SHA-1.) How do you get that CA to
> believe the two OTHER certs with DIFFERENT hashes you have to create so you
> can have two docs with the same hash?

There's only 2 certs.  You generate 2 certs with the same hash, and *then* get
the CA to sign one of them.
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