Attaboy!!! __________________________________________________________________ From: "wirelesswarrior@Safe-mail.net" To: jdb10987@yahoo.com Cc: juan.g71@gmail.com; cypherpunks@cpunks.org Sent: Tuesday, September 22, 2015 6:56 PM Subject: Focusing x-rays -------- Original Message -------- From: jim bell Apparently from: cypherpunks-bounces@cpunks.org To: Juan , "cypherpunks@cpunks.org" 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". [1]http://nypost.com/2015/08/18/kkk-member-built-death-ray-machine-to-k ill-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 References 1. http://nypost.com/2015/08/18/kkk-member-built-death-ray-machine-to-kill-muslims-and-obama-prosecutors-say/