Stealing Keys from PCs using a Radio

[grarpamp]

http://www.tau.ac.il/~tromer/radioexp/

We demonstrate  the  extraction  of secret  decryption  keys  from  laptop
computers, by nonintrusively  measuring electromagnetic  emanations for  a
few seconds from a  distance of 50  cm. The attack  can be executed  using
cheap and readily-available equipment: a consumer-grade radio receiver  or
a Software Defined Radio USB dongle. The setup is compact and can  operate
untethered; it can be  easily concealed, e.g.,  inside pita bread.

Perhaps someday extensible to coffeeshop pretext:
"hey, can you help me test my bitcoin, let's swap a satoshi..."