[Cryptech Tech] Use case for AES-192?

[Russ Housley]

I do not know anyone that is making use of AES-192, but AES-128 and AES-256 are in heavy use.

Russ


On Jul 21, 2014, at 4:35 PM, Joachim Strömbergson wrote:

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> Aloha!
> 
> The recent discussion on ietf-cfrg maillist regarding the key strengths
> for asymmetric vs symmetric algorithms (and requirements in Suite B) [1]
> got me thinking.
> 
> Are there any of our primary use cases that would require AES-192? Or
> would AES-128 and AES-256 suffice? (Say yes, please. ;-)
> 
> There isn't that big additional complexity to support AES-192, but there
> is some and needs to be tested. I would prefer only having 128 and 256 keys.
> 
> 
> [1] This discussion highlighted the fact that AES often is used with 256
> bit keys, but asymmetric primitives (EC) use 384 bit key lengths, or 192
> equivalent strength. The reason for this seemed to be that Suite B
> called for 192 bit strength, but no AES implementation implemented 192
> bits, only 128 and 256. Thus 256 is used.
> 
> - -- 
> Med vänlig hälsning, Yours
> 
> Joachim Strömbergson - Alltid i harmonisk svängning.
> ========================================================================
> Joachim Strömbergson          Secworks AB          joachim at secworks.se
> ========================================================================
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