[openssl-users] Why openssl 1.0.1p accepts composite $q$ in DSA?

Georgi Guninski guninski at guninski.com
Wed Sep 9 12:17:01 UTC 2015

On Wed, Sep 09, 2015 at 12:07:43PM +0000, Viktor Dukhovni wrote:
> > 
> > Are you saying I can't sign the cert with another cert
> > (the pubkey is easy to extract from the cert) with openssl?
> If you control a trusted root CA, or an intermediate CA issued
> (possibly indirectly) by a trusted root CA, you can sign anything
> you want and it will be trusted.  The fact that malfeasant CAs can
> compromise security is not new.
> If you don't control a trusted CA, what significance would such a
> signature carry?  Yes, most certificates (sometimes constrained by
> KeyUsage) can be used for signing, but unless "CA=true", they can't
> be used to sign other certificates that will be trusted by peers.

I am gonna leave this list very soon.

Feel free to CC me with answer:

If I am CA and sign cert requests with vanilla openssl,
will I sign a composite $q$?

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