Fuzzy Extractor

Fuzzy extractors are a cryptography primitive designed to reliably derive keys from noisy sources. This makes them suitable for areas like biometric authentication where two measurements of the same subject can yield slightly different values. This implementation uses hamming distance as its error metric, meaning that two binary strings will produce the same key with very high probability if their hamming distance is within some given threshold.

The storage and retrieval of keys is performed using a primitive known as a digital locker. More information is available in the references section of this documentation.

• Canetti, Ran, et al. “Reusable fuzzy extractors for low-entropy distributions.” Annual International Conference on the Theory and Applications of Cryptographic Techniques. Springer, Berlin, Heidelberg, 2016.