[cap-talk] use of hashcodes?

[Sandro Magi]

On 21/02/2010 2:08 AM, David Wagner wrote:
> The 'numbers' are in 1000s of bytes per second processed.
> type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
> sha256           40037.36k    87115.58k   148240.04k   181244.59k 193036.29k
> 
> We're talking about speeds in the range of 80-200 MB/s.  That's fast,
> probably far faster than the network connection that Waterken will be
> hooked up to.  I doubt that SHA256-HMAC is the performance bottleneck
> in Waterken (though if you think it is, the best way to tell for sure
> is to conduct careful performance measurements and share the results).

If you're really crazy about performance, or have limited hardware
available, a MAC based on universal hashing (UMAC) seems to be gaining
popularity [1], although they currently top out at 96-bit hashes. Their
performance numbers are impressive [2].

Sandro

[1] http://en.wikipedia.org/wiki/UMAC
[2] http://fastcrypto.org/umac/2004/perf04.html