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(....)In 1995, an attack technique was published that measured minute differences in the time taken to execute chosen instructions, enabling secret binary key values stored in the smartcard to be deduced. In 1996, this class of attack was developed further. Cryptographic researchers in San Francisco discovered two powerful new non-invasive smartcard attacks which they named simple power analysis (SPA) and differential power analysis (DPA). The SPA attack exploits the fact that the amount of power consumed by a smartcard chip is directly related to the sequence of software instructions it executes. This will reveal cryptographic key values. The attack can be defeated relatively easily by using a combination of software and hardware techniques to create enough random 'noise' to mask the internal instructions being performed(.....)
(....) However, the DPA attack is far more difficult to defeat. DPA relies on collecting a large number of data samples and using statistical techniques to screen out any masking noise. Paul Kocher, the developer of DPA, claims that he has never seen a smartcard that cannot be compromised to some degree using this technique (....)
