> Remember that GSM phones and US digital cellphones support encryption.
> All broken, of course, but it _is_ encryption.
> In some countries the PTT turns off GSM encryption or forces use of A5/2.
> In the US, the different cellphone standards support different crypto,
> and some cell companies or cell sites don't use it.
I know a fellow who does CDPD for a big vendor. When in maintenance mode,
encryption is disabled. He returned to an urban node a couple of weeks
after work had been done and found that maintenance mode was still on, and
all the credit-card swipes had been going over the air in the clear during
the interval. Whoops!
