Systems and methods for extending the domain of biometric template protection algorithms from integer-valued feature vectors to real-valued feature vectors

A system, comprising:

• a processor;
• a non-transitory computer-readable storage medium comprising programming instructions that are configured to cause the processor to implement a method for generating a secure biometric template, wherein the programming instructions comprise instructions to:
• obtain biometric data from an individual, the biometric data represented as a real-valued feature vector x;
• map the real-valued feature vector x to an integer-valued feature vector X by multiplying each component of the real-valued feature vector x by a value s and performing a nearest integer function using results of the multiplying, where s is a function of n, p and ϵ, n is a length of the real-valued feature vector x, p is a known parameter of a distance function used to determine a distance between two biometric templates, and ϵ is a parameter ensuring retention of biometric data accuracy while the biometric template is being generated;
• generate the secure biometric template by a cryptographic algorithm using the integer-valued feature vector X as an input;
• and
• use the secure biometric template for computer security purposes.