On 24 Feb 2011, at 23:54, Tom Keiser wrote:

> What do people think of such a proposal?

My preference would be to require that new security layers include a place in 
which application specific data may be inserted to encode endpoint information. 
We'd then define both a "clear" security class that purely carries application 
specific data, and what that data should look like for the AFS-3 protocol. rxgk 
already contains space to carry this kind of data as part of the connection 
negotiation.

I had thought that our discussion in Edinburgh had concluded that the correct 
place for encoding endpoint information was during security layer 
establishment. However, rxrpc-sec-clear seems to be proposing that the 
information is carried as part of the security header on every packet. This is 
a significant overhead, especially given the limited size of rx/udp packets, 
and the existing security overhead on these. It's unclear to me what benefits 
attaching this header to every packet provides, in contrast to the significant 
performance impact it will cause on bulk transfers.

Cheers,

Simon.

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