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One of the main issues in biometric authentication systems is to protect a biometric template database from compromise. Biometric information is so unique to each user and unchangeable during his or her lifetime. Once biometric template is leaked together with his or her identity, the person will face a severe risk of identity theft. Widely used template protection systems for biometric authentication systems are tamper-proof hardware-based systems, where biometric template is stored in an ordinary storage as an encrypted form and decrypted only within a tamper-proof hardware when matching is required. In these systems, even if the database is compromised, bio-metric information never made public.
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