Abstract or Summary:
Strong authentication using biometric-based technologies have been deployed for decades, but as the use of biometrics becomes more wide-spread, the privacy concerns that stem from their use are becoming more apparent. Over the past decade there has been progress toward privacy-enhanced biometric-based technologies that can address the privacy concerns while maintaining the strong authentication properties of biometrics. Early work was not sufficiently accurate/secure, and some of these techniques have been "cracked". However, recent work has produced solutions that are sufficiently accurate and secure for broad usage. We will briefly review the state of privacy-enhanced biometrics and template protection techniques, and then dive deeper into the subclass called biocryptographic techniques -- techniques which bind biometric data and key/token data such that biometric matching releases the key/token.