Cryptographic algorithms albeit mathematically
sure may have security breaches when implemented on hardware
chips. There are several ways to compromise their security, one
method is to analyze their electromagnetic (EM) emissions in
order to find secrets (cryptographic keys for example). This paper
proposes a proof of concept of a countermeasure against these
attacks, it is based on a chaotic oscillator coupled with an antenna
to blur the EM emissions of the chip. The objective is to generate
EM noise within the chip with an internal system in order to
make the secret information harder to extract. A testchip was
developed and tested in conditions as close as possible to real usecase
to prove the relevance of the concept. The EM field collected
while running the chip were superposed to AES (Advanced
Encryption Standard) emissions collected using a similar setup to
test the disturbing effect of the noise on a CPA, a classic attack to
retrieve AES keys. The experiment shows that it can effectively
increase the difficulty of finding the keys, proving that the basic
concept and the developed chip can be used as a countermeasure
for EM analysis attacks.
