On Mon, Nov 28, 2016 at 09:53:35PM +0000, Paul Miller (NT) wrote:
> Minimum length is a problematic topic due to the fact that we intentionally 
> did not specify the format of the freshness token.  Since the structure of 
> the freshness token is left up to the KDC, there is no good way to determine 
> a minimum size.  If the freshness token is a nonce then the size is 
> determined by the birthday problem.  If it is based on symmetric 
> cryptography, then there are different length considerations.  If it is based 
> on asymmetric crypto then there is a third set of size considerations.

We could still mention in the security considerations that depending on the
construction of the token, the token should have some minimum size; essentially,
your text from above.

-Ben

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