I remember this being done with microphones, listening to the clicks of the coils. Related? http://www.cs.tau.ac.il/~tromer/acoustic/ http://www.cs.tau.ac.il/~

I remember this being done with microphones, listening to the clicks of the coils. Related? http://www.cs.tau.ac.il/~tromer/acoustic/ http://www.cs.tau.ac.il/~tromer/acoustic/ Edit, found in one of the links on that page, seems this is the same group http://www.cs.tau.ac.il/~tromer/ecdh/ http://www.cs.tau.ac.il/~tromer/ecdh/