Hardware Reference
In-Depth Information
Encrypting EEPROM data with the
ATAES132
The ATAES132 is a 32kb EEPROM that can be encrypted with AES using a 128-bit key
using the
Counter with CBC-MAC
(
CCM
) mode. CCM provides an authenticated en-
cryption mode. With an encrypted EEPROM, you can store small amounts of data-at-rest
more securely. The ATAES132 also has the ability to encrypt and decrypt small packets of
up to 32 bytes and return the result over the bus. The AES key remains in the device at all
times.
At the time of writing this, there isn't a Linux driver for the ATAES132 device, but Atmel
provides full documentation and an AVR-based library on their website at
ht-
