hardwear.io 2017:- TEMPEST Attacks Against AES by Craig Ramsay

Side-channel attacks can recover secret keys from cryptographic algorithms (including the pervasive AES) using measurements such as power use. However, these previously-known attacks on AES tend to require unrestricted, physical access to the device. Using improved antenna and signal processing, Fox-IT and Riscure show how to covertly recover the encryption key from two realistic AES-256 implementations while:

1. Attacking at a distance of up to 1 m (30 cm in realistic conditions; "TEMPEST"),

2. Using minimal equipment (fits in a jacket pocket, costs less than €200) and

3. Needing only a few minutes (5 minutes for 1 m and 50 seconds for 30 cm.)
To the best of our knowledge, this is the first public demonstration of such covert attacks from a distance.

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