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Re: RC5 Performance Information

To: baldwin <baldwin@rsa.com>
Subject: Re: RC5 Performance Information
From: "Perry E. Metzger" <perry@piermont.com>
Date: Tue, 19 Mar 1996 12:28:44 -0500
Cc: ipsec@ans.net
In-Reply-To: Your message of "Mon, 18 Mar 1996 12:14:36 PST." <9602198272.AA827251852@snail.rsa.com>
Reply-To: perry@piermont.com
Sender: ipsec-request@neptune.tis.com


baldwin writes:
>         One reason for using RC5 in an ESP is to get higher performance.

If one wants higher performance and one is willing to use patented
algorithms, there are better ones out there. IBM's SEAL, developed by
Don Coppersmith, comes to mind. It also hasn't been studied well
enough, but it has been studied better than RC5 and is blazingly fast
-- far faster than RC5.

If one needs real performance in a firewall or routing product,
however, the right answer is hardware. Gigabit 3DES encrypting chips
exist.

If one insists on software and is willing to use things that are
insufficiently studied, code known to be compatible with RC4 and free
of any intellectual property restrictions is available on the net, and
is faster than RC5.

In any case, I believe it is time to get off this topic. The point has
been made.

Perry

References:

RC5 Performance Information

From: baldwin <baldwin@rsa.com>

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