[Ach] Vote for new Cipherstring B [Was: Issue with OpenSSL >0.9.8l]

[christian mock]

OK, just trying to bring this up after today's meeting -- can we find
an agreement on the "drop AES/CAMELLIA 256" issue? And if we do, can
we also drop SHA384, to further simplify the cipher string?

My vote: drop *256 and SHA384. 

cm.

On Tue, May 13, 2014 at 08:31:48PM +0200, Aaron Zauner wrote:
> Ok, I've come up with the following B cipherstring:
> 
> ```
> EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECDH+aRSA+SHA256:EECDH:+CAMELLIA256:+AES256:+CAMELLIA128:+AES128:+SSLv3:!aNULL:!eNULL:!LOW:!3DES:!MD5:!EXP:!PSK:!DSS:!RC4:!SEED:!IDEA:!ECDSA:kEDH:CAMELLIA256-SHA:AES256-SHA:CAMELLIA128-SHA:AES128-SHA
> ``
> 
> This works for all versions that I've tested (0.9.8+).
> 
> 
> Another issue I'd like to discuss:
> 
> There's still a thing that bothers me a bit, we're using AES256
> everywhere, there are very little devices that will not support this,
> which means that either:
> 
> 	- we can get rid of AES128 completely
> 	- we can get rid of AES256 completely
> 
> I'd opt for the second option, we sill have a A cipherstring that serves
> only AES256, there's really no need to have it in our B cipherstring.
> Even if quantum computers become a reality (which is unlikely for the
> next decades - but don't believe me, hear it from schneier [0]) AES128
> provides around (2^128)/2 security (brute force in a quantum computer)
> [1]. This would also shorten our cipherstring and as such make it
> possible for use in software that has a restricted character limit for a
> cipherstring option (such as OpenVPN).
> 
> Any input on that? I don't think it does weaken our B recommendation -
> it simplifies it.
> 
> 
> Aaron
> 
> [0] https://www.youtube.com/watch?v=hSFgHVTWq0w#t=2638
> [1]
> http://pqcrypto.org/www.springer.com/cda/content/document/cda_downloaddocument/9783540887010-c1.pdf
> 



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-- 
Christian Mock                          Wiedner Hauptstr. 15
Senior Security Engineer                1040 Wien
CoreTEC IT Security Solutions GmbH      +43-1-5037273
FN 214709 z

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