Biometrics Based Privacy-Preserving Authentication and Mobile Template Protection

Algorithm 1

Feature decorrelation algorithm.

INPUT: the original feature

Process:

Step 1: Each position of value 1 that is located in

the binary string , is input into a folding

function , where is an

application-specific parameter and set to be smaller

than . is a modulo operation, for example,

mod(7,5) = 2 and mod(12,5) = 2.

Step 2: With each value of 1 in relocated to a

new position depending on , a new binary string

of length is generated.

Step 3:   is converted into a real-value vector

through the Discrete Fourier Transform (DFT) as

.

OUTPUT: decorrelated feature