Re: [cryptography] DKIM: Who cares?

2012-10-26 Thread James A. Donald
On 2012-10-26 2:44 AM, Ben Laurie wrote: As someone who sees the effects of actually using DKIM, I can but roll my eyes and shrug. In short, it turns out to be a pretty bad idea to hard fail on DKIM because it totally doesn't work with mailing lists. Which makes it pretty useless, key size

Re: [cryptography] DKIM: Who cares?

2012-10-26 Thread Peter Gutmann
John Levine jo...@iecc.com writes: Hmmn. Is there some point to speculating about the behavior of mail systems about which you know nothing? Absolutely. We have a system design to perform a certain function (and, unfortunately, mis-marketed as being a solution to a rather different problem,

Re: [cryptography] DKIM makes Wired

2012-10-26 Thread Peter Gutmann
Dave Crocker dcroc...@bbiw.net writes: In summary, it turns out that what seems like half the world's DKIM users are using toy keys as short as 384 bits. Since neither Wired nor CERT cited anyone's using 384-bit DKIM keys, I don't know where this assertion comes from. Harris found three

Re: [cryptography] DKIM: Who cares?

2012-10-26 Thread ianG
On 26/10/12 20:11 PM, Peter Gutmann wrote: John Levine jo...@iecc.com writes: Hmmn. Is there some point to speculating about the behavior of mail systems about which you know nothing? Absolutely. We have a system design to perform a certain function (and, unfortunately, mis-marketed as

Re: [cryptography] DKIM: Who cares?

2012-10-26 Thread Thierry Moreau
Peter Gutmann wrote: John Levine jo...@iecc.com writes: Is there some point to speculating ...? Absolutely. ... ... so I'm assuming there was some business-case issue ... ... a security mechanism was deployed on a large scale ... Let me speculate a moment. The 384 bits keys are much

Re: [cryptography] DKIM: Who cares?

2012-10-26 Thread James A. Donald
On 2012-10-26 7:11 PM, Peter Gutmann wrote: I'd like to find out what caused this, not to lay blame, but to understand what the issue was and to make sure that it won't come back to bite us again in future deployments. My own experience, not necessarily typical and representative, is that it

Re: [cryptography] Just how bad is OpenSSL ?

2012-10-26 Thread Andy Isaacson
On Fri, Oct 26, 2012 at 06:29:47PM +, John Case wrote: So, given what is in the stanford report and then reading this rant about openssl, I am wondering just how bad openssl is ? I've never had to implement it or code with it, so I really have no idea. How long has it been understood

Re: [cryptography] DKIM: Who cares?

2012-10-26 Thread Andy Steingruebl
On Fri, Oct 26, 2012 at 2:27 AM, ianG i...@iang.org wrote: - It probably wasn't an accidental mis-config, because it's unlikely that a pile of major organisations would all make the same config mistake. Look at SSL, the exact same organisations have no problem using strong SSL keys,

Re: [cryptography] DKIM: Who cares?

2012-10-26 Thread Jim Fenton
On 10/24/12 9:18 PM, Jon Callas wrote: Note the weasel-words long-lived. I think that the people caught out in this were risking things -- but let's also note that the length of exposure is the TTL of the DNS entries. I wouldn't characterize those as weasel-words, but rather that they were