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We propose a biometric identification system where the chosen- andgenerated-secret keys are used simultaneously, and investigate its fundamentallimits from information-theoretic perspectives. The system consists of twophases: enrollment and identification phases. In the enrollment phase, for eachuser, the encoder uses a secret key, which is chosen independently, and thebiometric identifier to generate another secret key and a helper {data}. In theidentification phase, observing the biometric sequence of the identified user,the decoder estimates index, chosen- and generated-secret keys of theidentified user based on the helper {data} stored in the system database. Inthis study, the capacity region of such a system is characterized. In theproblem setting, we allow chosen- and generated-secret keys to be correlated.As a result, by permitting the correlation of the two secret keys, the sum rateof the identification, chosen- and {generated-secret key} rates can achieve alarger value compared to the case where the keys {do not correlate}. Moreover,the minimum amount of the storage rate changes in accordance with both theidentification and chosen-secret key rates, but that of the privacy-leakagerate depends only on the identification rate.

ieice transactions on fundamentals of electronics, communications and computer sciences/ieice transactions on fundamentals of electronics, communications and computer science

Biometric Identification Systems With Both Chosen and Generated Secret Keys by Allowing Correlation