Masking Techniques

Masking techniques are used in cryptographic hardware to prevent side-channel attacks by randomizing the internal data being processed. By splitting secret data into multiple shares that are combined only at the final step, the physical leakage (like power or EM emissions) becomes statistically independent of the actual secret value.

This effectively hides the sensitive information from an attacker observing the device's physical outputs. It is a complex but necessary defense for high-security hardware that cannot be easily shielded from observation.

As financial systems rely more on hardware security, masking becomes a standard requirement for ensuring that physical attacks do not lead to financial loss. It is a sophisticated way to decouple the mathematical operation from its physical signature.