>> The point of using the >> old photoreceptor was that way we were dead certain there was no >> exploitable integrated circuit in the photoreceptor... > > I don't really see the point of purposely reducing the bitrate of a > serial link.
Supply chain security. The more complicated the hardware, the harder it is to prove the ICs and firmware haven't been exploited. If you're using hardware you scavenged from a ham radio swap meet, you can be pretty sure there's nothing malicious in the hardware. Our use case was a vote tabulating system communicating realtime updates with a publicly-facing web server. The assumption was the web server was compromised: given that, how can you be absolutely sure there's no communication channel back to the trusted tabulator? Answer: a 1960s photoreceptor. We didn't need a fast link from the tabulator to the web server: we needed a slow and absolutely, positively, definitively one-way link. _______________________________________________ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users