On Sun, 8 Sep 2013, Perry E. Metzger wrote:
> What's the current state of the art of attacks against AES? Is the
> advice that AES-128 is (slightly) more secure than AES-256, at least
> in theory, still current?

I am not sure what is the exact attack you are talking about, but I 
guess you misunderstood the result that says: "the attack works 
against AES-256, but not against AES-128" as meaning that AES-128 is 
more secure. It can be the case that to break AES-128 the attack needs 
2^240 time, while to break AES-256 it needs 2^250 time. Here AES-128 
is not technically broken, since 2^240 > 2^128, but AES-256 is broken, 
since 2^250 < 2^256, OTOH, AES-256 is still more secure against the 

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