[Cryptech Tech] Use case for AES-192?

[Joachim Strömbergson]

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Aloha!

Bernd Paysan wrote:
> From a cryptanalytic point of view, this 2009 blog posting from Bruce
> Schneier is worth to read:
> 
> https://www.schneier.com/blog/archives/2009/07/another_new_aes.html
> 
> Effectively, AES has not the security margin it would neet to meet
> its promises (especially with AES-256).  The bottom line is that
> AES-128 has a sufficiently good key schedule, while AES-256 has a bad
> key schedule, and breaking it is possible with the order of 2^100
> (this is too big to allow a practicable attack).  That means: If you
> decide today, use AES-128 instead of AES-256.  AES-192 is indeed
> rarely used, people either think "let's take the biggest number" or
> "let's take the fastest operation".

Yes and a good point. The key schedule for 192 and esp 256 is weird
structurally.

- -- 
Med vänlig hälsning, Yours

Joachim Strömbergson - Alltid i harmonisk svängning.
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 Joachim Strömbergson          Secworks AB          joachim at secworks.se
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