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STORM— Small Table Oriented Redundancy-based SCA Mitigation for AES

STORM effectively solves the long-standing challenge of combining high security against SCA with low gate count and high performance for AES implementations by offering a different tradeoff (memory utilization) that may be preferable to RAMBAM in many practical cases.

Unlike RAMBAM for which it is experimentally shown that the leakage rapidly decreases as redundancy grows, but lacks a security proof (though the intuition behind this is explained), STORM has proven security. 

For applications with limited resources (e.g., IoT devices) STORM can be configured with a relatively small amount of SRAM, starting from 4 KB. For applications that require high performance (e.g., servers with intensive encrypted communications) the SRAM size is typically not a limiting factor, and the various advantages of STORM compared to other solutions are quite significant.

Fortify’s AES security evaluation by SGS

“Summary. The leakage analysis (Welch t-test) on over 30 million traces did not show statistically significant first- and second-order differences between trace sets with fixed and random inputs. The template-based DPA analysis, on the pseudo-random trace set for the profiling phase (15 million traces) and on a sub-set of 300k fix input traces for matching phase targeting the first-round S-box output, and template attack on ciphertext, did not indicate any potential information leakage.”

” The results for the soft IP presented in the report were obtained on the TOE which is the basic hardware implementation of the soft IP without additional levels of security (e.g. that are present in a secure silicon layout). Therefore the internal strength of the soft IP itself was evaluated. This indicates that the investigated features and parameters of the soft IP implementation should be robust against SCA and fault injection attacks in different implementations including ASIC. Nevertheless, according to the Common Criteria rules, the strength of the final composite product must be evaluated on its own.”

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