Paper This work was presented in CHES 2014 and published in its proceedings. An extended version (PDF, 5.3MB) is available, archived as IACR ePrint 2014/626. Updates In February 2015 we published a follow-up paper, "Stealing Keys from PCs using a Radio: Cheap Electromagnetic Attacks on Windowed Exponentiation", which shows how to extract RSA and ElGamal keys from modern implementations (that use