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We simulate a user authentication from multiple biometircs in Python. To simulate it, we need an attribute based encryption ABE (FAME: Fast Attribute-based Message Encryption, CCS17), and a fuzzy extractor FE (Reusable fuzzy extractors for low-entropy distributions, EUROCRYPT16).
Browser-based fuzzy-extractor demo — turn a noisy reading that never repeats into the same key every time with a code-offset secure sketch over hand-built BCH codes and HKDF-SHA-256, and measure exactly what entropy the public helper data costs.