I can't find a lot of resources on actually using a magnetic probe for power analysis. I've tried testing this probing method by touching a loop probe connected to the LNA to various points on the multi-target victim board while the simpleserial crypto (AES) program is running. So far I haven't found any interesting signals (nothing matching the waveform I get directly from Vout), just sine waves. Should I be expecting a similar waveform, or will the signal need some processing when I use this method?
There should be a similar waveform - but the signal from the AVR is fairly week, so I normally don't see as much. Can you post screen-shots of the waveforms you get?
Will be a little slower than usual due to travel for Defcon/Blackhat... also don't have any H-probes with me to validate things!