-------- Original Message -------- From: jim bell <[email protected]> Apparently from: [email protected] To: Juan <[email protected]>, "[email protected]" <[email protected]> Subject: Re: How much/what hardware does the rowhammer DRAM bug affects? Date: Fri, 18 Sep 2015 21:30:32 +0000 (UTC)
> >Within the last couple of months, I think somebody was arrested for planning > >some sort of "X-ray death ray". > >http://nypost.com/2015/08/18/kkk-member-built-death-ray-machine-to-kill-muslims-and-obama-prosecutors-say/ > > But only a dweeb doesn't know that X-rays cannot be focussed. (With > >one very obscure exception not applicable here. Find it and get an > >"attaboy!". ) > > Its called Grazing Incidence > > https://en.wikipedia.org/wiki/X-ray_optics > > > >Microwaves, OTOH, can be focussed rather easily. The frequency is 2.45 Ghz, > >at about 1 Kilowatt. (wavelength about 12 centimeters.) I'd have to > >consult a Radio Amateur's handbook, but a modern dish (intended or Directv > >or Dish network) could probably get 15-20 db of gain, compared with > >isotropic. An old-style 8-foot dish probably would do 30 db gain. That > >would be 100 kilowatts ERP. > > >Such an unshielded (open) device would probably impair WiFi at 2.5 Ghz > >severely, if you're close to it, say a few hundred feet away. Fortunately, > >I think microwave ovens have better than 60 db of shielding. A few 10s of > >feet, away, hardware damage might occur if that full 1 kw were allowed to > >leak out. > Jim Bell > > > > >
