"John Rumm" wrote in message
o.uk...
On 15/03/2017 17:07, tim... wrote:


Remember, this is a download being broadcast to 100,000 (or 1 million)
separate devices all at the same time

This isn't a point to point communications link

Which "this" are you referring to in particular?

the way that updates are downloaded to TVs etc

the one that is currently insecure, that we need to make secure, to stop the
spooks using it to download their dodgy software.

It's already been suggested that if the spooks have access to a specific TV
so that they can download the code manually, they can just as easily plant
some normal bugs and not have to engage in the expensive task of
re-engineering the TV's software

True multipoint comms (e.g. multicast) on the internet is still fairly

but these devices are not always "on the internet"

the devices that I worked with were not

And I'm still interested in how I make that download of new software secure,
without having to resort to "keeping the key secret" (as will my ex-employer
and his clients - world leading in their sector, though not internet
security obviously)

tim