On Thu, 09 Mar 2006 02:10:58 -0500
[EMAIL PROTECTED] wrote:
> This is very useful for encrypting things like video
> streams without an expensive hardware cryptographic accelerator card.
>
I think you vastly overestimate how much hardware one needs to do
something like AES. I ran
dd if=/dev/zero bs=32k count=1024| openssl speed aes-128-cbc
on a 1500 Mhz Athlon. It reported speeds of ~27.5 MBps, or 220 Mbps.
Even video isn't that fast, and that's a slow CPU by today's standards.
Also -- I don't know how large these random tables have to be, but if
they don't fit in cache the cipher will be quite slow -- memory
bandwidth hasn't increased nearly as rapidly as CPU speed; modern
machines utterly rely on their caches.
--Steven M. Bellovin, http://www.cs.columbia.edu/~smb
---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]
