[Cryptography] BBC to deploy detection vans to snoop on internet users

[Dave Horsfall]

On Tue, 9 Aug 2016, Sampo Syreeni wrote:

> As for the cat detection van... Obviously that skit was inspired by the 
> earliest BBC detection vans, which probably relied on principles similar 
> to those utilized in radar detectors. Detection of a common intermediate 
> frequency in television sets, or perhaps even the line frequency 
> harmonics from the tube itself.

No; they relied upon detecting the local oscillator which radiated quite 
nicely from the (gain) antenna due to poor isolation (i.e. design), and as 
it varied with the frequency you could tell to which channel the TV was 
tuned.

Sort of related to crypto, I guess; you know, leaking information and all 
that...

And as Eric was such a 'appy cat 'e was a piece of cake...

-- 
Dave Horsfall DTM (VK2KFU)  "Those who don't understand security will suffer."