On Monday 27 December 2010 14:34:03 Martin Nyhus wrote:
> On Friday 24. December 2010 16:26:59 Matthew Toseland wrote:
> > On Tuesday 21 December 2010 23:18:50 Martin Nyhus wrote:
> > > At the moment I'm not using the first bit of the sequence number for some
> > > reason (that I can't remember).
> > Worth checking but not critical.
>
> I've already done it, but the extra complexity might not be worth it. Feel
> free to ask me to revert it if you agree.
>
> > > There is also the problem of message ids
> > > wrapping within the watchlist window, but I don't think it can happen
> > > with the current code unless the sender actively makes it happen.
> > Right. Well, if it's not going to happen naturally, it's an exploit, but
> > AFAICS it's not a useful exploit, right?
>
> I thought about this over the weekend and I've convinced myself that it can't
> happen unless the sender uses only every ~1000th message id, and I can't see
> that happening without changing the code. If it were to happen it would be
> possible to replace parts of a message with the same parts of an earlier
> message with the same id.
>
> Some numbers:
>
> Assuming we can send 1400 messages in a packet (way too high...) we can send
> 1.4M messages in the window, which isn't anywhere near the number needed for
> wrapping the ids (2^28 or ~268M). In practice I'd say the average number of
> messages per packet is roughly 10.
>
Okay, it's all merged, and mostly working. I've corrected a number of issues.
Thanks!
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