However, we discovered a number of "ancillary" people, part of other business units, not directly involved in "Integra" that actually played a role in the project (e.g., helpers, information conveyors, etc).
Furthermore, the helper data leaks information about the biometric, since the intervals have unequal width and therefore unequal probabilities of producing reliable components [19].
Key binding and generation systems use helper data, which is public information, about the biometric template for verification.
A second factor which affects the security of biometric cryptosystems is privacy leakage, i.e., the information that the helper data contain (leak) about biometric data [134].
In addition, stability of biometric features is required to limit information leakage of stored helper data.
Ideally, the helper data would contain just enough information to enable the error correction.
Also, Ignatenko et al. analyze the privacy leakage in terms of the mutual information between the public helper data and biometric features in a biometric template protection method.
Helper data: It is auxiliary data/side information, which is needed for running biometric system successfully (e.g., data for alignment, parity bits of error correction codes).
Helper data, which must not reveal significant information about original biometric templates, assists in reconstructing keys.
Therefore, helper data must be uncorrelated to such information in order to defeat any adversary's privacy violation attempt upon revealing it. .
All you do is speak, click, or type, and your little helper collects information from a slew of websites, assisting you in your decision-making process.
