Microsoft deems all DigiNotar certificates untrustworthy, releases updates

Jimmy Hess mysidia at gmail.com
Sun Sep 11 18:02:03 CDT 2011


On Sun, Sep 11, 2011 at 1:30 AM, Damian Menscher <damian at google.com> wrote:
> On Fri, Sep 9, 2011 at 11:33 PM, Jimmy Hess <mysidia at gmail.com> wrote:
> Because of that lost trust, any cross-signed cert would likely be revoked by
> the browsers.  It would also make the browser vendors question whether the

I am not engaging in speculation that DigiNotar plans to continue to
operate, they have already stated so much.
http://www.vasco.com/company/press_room/news_archive/2011/news_diginotar_reports_security_incident.aspx
"VASCO does not expect that the DigiNotar security incident will have
a significant impact on the company’s future revenue or business
plans."

So long as DigiNotar can show what they are required to show when they
would request
re-signing, and another CA can legitimately cross-sign their cert,
following that CA's official
correct certification practices;  it's unlikely to lead to the signer
being revoked.

As far as we know, DigiNotar is not dead,  it is just a really great
example showing how broken TLS security model is.
The trust model hard-coded into the protocol is much weaker than the
cryptography.


Since the browsers already approved that root CA's certification
practices. Particularly not
if the cross-signer is one of the larger CAs such as  Thawte or Verisign   ---
the browser might as well  remove SSL support altogether, if they will
perform a revokation
that renders 40% of internet web server SSL certs invalid.

--
-JH



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