论文标题
通过允许相关性，具有选择和生成的秘密键的生物识别系统
Biometric Identification Systems With Both Chosen and Generated Secret Keys by Allowing Correlation
论文作者
论文摘要
我们提出了一个生物特征识别系统，同时使用所选和生成的秘密密钥，并从信息理论的角度研究其基本限制。该系统由两个阶段组成：注册和识别阶段。在注册阶段，对于每个用户，编码器使用一个独立选择的秘密密钥，以及生物识别标识符生成另一个秘密密钥和助手{data}。在识别阶段，观察已识别用户的生物识别序列，解码器估计索引，根据系统数据库中存储的助手{data}的识别用户的选择和生成的固定键。在这项研究中，这种系统的容量区域是表征的。在问题设置中，我们允许选择和生成的秘密键关联。结果，通过允许两个秘密密钥的相关性，与键{不关联}相比，所选标识和{生成的固定键}速率的标识总率可以实现更大的值。此外，存储率的最低量根据标识和选择的密钥率都会变化，但是隐私透露率的率仅取决于识别率。
We propose a biometric identification system where the chosen- and generated-secret keys are used simultaneously, and investigate its fundamental limits from information-theoretic perspectives. The system consists of two phases: enrollment and identification phases. In the enrollment phase, for each user, the encoder uses a secret key, which is chosen independently, and the biometric identifier to generate another secret key and a helper {data}. In the identification phase, observing the biometric sequence of the identified user, the decoder estimates index, chosen- and generated-secret keys of the identified user based on the helper {data} stored in the system database. In this study, the capacity region of such a system is characterized. In the problem 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 rate of the identification, chosen- and {generated-secret key} rates can achieve a larger value compared to the case where the keys {do not correlate}. Moreover, the minimum amount of the storage rate changes in accordance with both the identification and chosen-secret key rates, but that of the privacy-leakage rate depends only on the identification rate.
