[Sis-csi] noting unusual CCSDS security critique

[Lloyd Wood]

At 03:05 PM 10/5/2005 -0400, Krupiarz, Christopher wrote:
>Lloyd,
>
>Thanks for the clarification.  I'm not sure if this is a question for
>the SSTL authors instead of you, but I'll ask anyway.
>
>In the most recent paper, the replacement protocol (Saratoga) is
>described as having a smaller footprint and increased performance
>compared to the CFDP implementation and that the CFDP implementation was
>"considered large, slow and resource-hungry".

Christopher -- as you have read and as you state, that paper clearly refers 
specifically to the CFDP _implementation_. Twice.

It would be unscientific to draw conclusions about the worth of the CFDP 
protocol from a single implementation alone. However, reading the relevant 
Blue and Green Books should be more than sufficient to convince anyone that 
CFDP is large, fiddly, and has an overly complex state machine.

Saratoga ('a custom rate-based UDP-based file transfer protocol designed 
and implemented by SSTL', as the paper says) is proprietary to SSTL, as is 
the reference given for that. There are many other proprietary UDP-based 
transfer protocols (Real, for example).

In future, please do not forward off-list mail to a mailing list.

L.

>As a fellow developer,
>I'm reluctant to ask this question, but was it the implementation that
>didn't meet mission needs or the protocol?  I'm guessing it was at least
>in some part due to CFDP, but it's not clear in the paper why the
>protocol in particular was a problem.
>
>Also, can I assume Saratoga is proprietary?
>
>Chris
>
>
>
>-----Original Message-----
>From: Lloyd Wood [mailto:lwood at cisco.com]
>Sent: Wednesday, October 05, 2005 2:35 PM
>To: Krupiarz, Christopher
>Cc: Scott Burleigh
>Subject: RE: [Sis-csi] noting unusual CCSDS security critique
>
>
>At 02:24 PM 10/5/2005 -0400, Krupiarz, Christopher wrote:
> >Lloyd,
> >
> >That's interesting about SSTL & CFDP.  There's a fair number of papers
> >listed on your link (good to be prolific! ;).  Could you point out one
>in
> >particular that sums up the reasons behind the change and what is being
>
> >used instead?
>
>The strong links with bolded are recommended reading. The most recently
>submitted paper, at top, contains the most detail on that. Other papers
>whose content is completely included in that paper have that indicated
>on
>their individual abstracts pages, as a quick browse will show you.
>
>L.

--
Lloyd Wood (lwood at cisco.com) +44-7730-711075 / +44-20-8824-4236.
space initiatives manager in Global Defense, Space and Security.
New Square, Bedfont Lakes, London. http://www.cisco.com/go/space