On Wed, Feb 17, 2010 at 4:38 PM, Salman Abdul Baset
<[email protected]> wrote:
> Unless I misread your earlier post on this list, there may be a possibility
> of a collision attack. Although, as you pointed, it is a preimage resistance
> issue.
Again, huh?
The collision resistance of a b bit hash function is approximately 2^{b/2}.
The collision resistance of the first (or last, or any) b' bits of a b bit
hash function is approximately 2^{b'/2}.
> Rather than arguing about hash function properties, I think the most
> future-proof solution is:
>
> -fix a hash function for the mandatory-to-implement DHT, which is already
> there in the draft.
> -allow a large size hash function and corresponding length node-IDs to be
> used per overlay, by specifying them in the configuration file.
I don't understand why this is superior. Again, what's wrong with just having
fixed size node-IDs which are created by truncating a hash?
-Ekr
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