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Re: Security team successfully cracks SSL using 200 PS3's and MD5
From: Joe Abley <jabley () hopcount ca>
Date: Fri, 2 Jan 2009 12:39:30 -0500


On 2 Jan 2009, at 12:33, Joe Greco wrote:

We cannot continue to justify security failure on the basis that a
significant percentage of the clients don't support it, or are broken in
their support.  That's an argument for fixing the clients.

At a more basic level, though, isn't failure guaranteed for these kind of clients (web browsers) so long as users are conditioned to click OK/ Continue for every SSL certificate failure that is reported to them?

If I was attempting a large-scale man-in-the-middle attack, perhaps I'd be happier to do no work and intercept 5% of sessions (those who click OK on a certificate that is clearly bogus) than I would to do an enormous amount of work and intercept 100% (those who would see no warnings). And surely 5% is a massive under-estimate.


Joe



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