Re: Crypto dongles to secure online transactions

2009-11-17 Thread John Levine
So should or should not an embedded system have a remote management interface? In this case, heck, no. The whole point of this thing is that it is NOT remotely programmable to keep malware out. If you have a modest and well-defined spec, it is well within our abilities to produce reliable

Re: TLS break

2009-11-17 Thread Ben Laurie
On Mon, Nov 16, 2009 at 11:30 AM, Bernie Cosell ber...@fantasyfarm.com wrote: As I understand it, this is only really a vulnerability in situations where a command to do something *precedes* the authentication to enable the command.  The obvious place where this happens, of course, is with

Re: Crypto dongles to secure online transactions

2009-11-17 Thread Jerry Leichter
On Nov 16, 2009, at 12:30 PM, Jeremy Stanley wrote: If one organization distributes the dongles, they could accept only updates signed by that organization. We have pretty good methods for keeping private keys secret at the enterprise level, so the risks should be manageable. But even then,

Re: hedging our bets -- in case SHA-256 turns out to be insecure

2009-11-17 Thread Sandy Harris
On 11/12/09, David-Sarah Hopwood david-sa...@jacaranda.org wrote: Sandy Harris wrote: On 11/8/09, Zooko Wilcox-O'Hearn zo...@zooko.com wrote: Therefore I've been thinking about how to make Tahoe-LAFS robust against the possibility that SHA-256 will turn out to be insecure. [...]

Re: TLS break

2009-11-17 Thread Stefan Kelm
Jonathan, Anyone care to give a layman's explanation of the attack? The I find this paper to be useful: http://www.g-sec.lu/practicaltls.pdf Cheers, Stefan. -- Stefan Kelm sk...@bfk.de BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstrasse 100

Re: Crypto dongles to secure online transactions

2009-11-17 Thread Jeremy Stanley
On Mon, Nov 16, 2009 at 11:20:27PM -0500, Jerry Leichter wrote: I'm not sure that's the right lesson to learn. I might have, perhaps, phrased it a little better. Regardless of initial planning, TI continued selling devices relying on this particular code signing implementation well past what the

Re: Crypto dongles to secure online transactions

2009-11-17 Thread Victor Duchovni
On Tue, Nov 17, 2009 at 01:35:12AM -, John Levine wrote: So should or should not an embedded system have a remote management interface? In this case, heck, no. The whole point of this thing is that it is NOT remotely programmable to keep malware out. Which is perhaps why it is not a