North American Network Operators Group
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RE: VoIP over IPsec

  • From: Vadim Antonov
  • Date: Tue Feb 18 13:34:50 2003 
Well, sloppy thinking breeds complexity -- what I dislike about standards
commitees (IETF/IESG included) is that they always sink to the lowest
common denominator of the design talent or competence of its participants.

In fact, a method to encrypt small parcels of data efficiently is
well-known for decades.  It is called "stream cypher" (surprise). Besides
LFSR-based and other stream cyphers, any block cypher can be used in this
mode. Its application to RTP is trivial and straight-forward.  Just leave
sequence number in clear text, so that position in the stream is
recoverable in case of packet loss. It also allows precomputation of the
key stream, adding nearly zero latency/jitter to the actual packet
processing.

--vadim

On Wed, 19 Feb 2003, David Luyer wrote:

> ...leaving a dream of RTP as true and presumably light-weight
> protocol...