You could use the SSL Blacklist plugin (http://codefromthe70s.org/sslblacklist.asp) for Firefox or heise SSL Guardian (http://www.heise-online.co.uk/security/Heise-SSL-Guardian--/features/11 1039/) for IE to do this. If presented with a Debian key the show a warning. The blacklists are implemented using either a traditional blacklist (text file) or distributed using DNS. ~martin -----Original Message----- From: owner-cryptography@xxxxxxxxxxxx [mailto:owner-cryptography@xxxxxxxxxxxx] On Behalf Of Eric Rescorla Sent: 8. august 2008 17:06 To: Ben Laurie Cc: bugtraq@xxxxxxxxxxxxxxxxx; security@xxxxxxxxxx; OpenID List; cryptography@xxxxxxxxxxxx; full-disclosure@xxxxxxxxxxxxxxxxx Subject: Re: OpenID/Debian PRNG/DNS Cache poisoning advisory At Fri, 8 Aug 2008 11:50:59 +0100, Ben Laurie wrote: > However, since the CRLs will almost certainly not be checked, this > means the site will still be vulnerable to attack for the lifetime of > the certificate (and perhaps beyond, depending on user behaviour). > Note that shutting down the site DOES NOT prevent the attack. > > Therefore mitigation falls to other parties. > > 1. Browsers must check CRLs by default. Isn't this a good argument for blacklisting the keys on the client side? -Ekr --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to majordomo@xxxxxxxxxxxx ---------------------- Deloitte Disclaimer --------------------- This message (including any attachments) contains confidential information intended for a specific individual and purpose, and is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited. ----------------------------------------------------------------
