At the RSA computer security conference last week, Gary Kenworthy of Cryptography Research held up an iPod Touch on stage and looked over to a TV antenna three meters away. The signal picked up by the antenna, routed through an amplifier and computer software, revealed the secret key being used by an app running on the device to encrypt data. An attacker with access to this key could use it to perfectly impersonate the device he stole it from—to access e-mail on a company server, for example.
The antenna was detecting radio signals "leaking" from the transistors on the chip inside the phone performing the encryption calculations. Transistors leak those signals when they are active, so the pattern of signals from a chip provides an eavesdropper a representation of the work the chip is doing. ...
More in the article.
Looks like even the current hardware can be mitigated with software, but at a performance hit. Of course it would be worth the performance it not to have your apps for looking at your bank, credit cards, stocks, purchases, etc. openly available for picking through to get keys to do you financial or privacy damage, eh?
New mobile devices can be dealt with at the hardware level and save on the performance hit.
Edited by LilBambi, 26 April 2012 - 12:41 PM.