Table 1 Notations and their descriptions
From: Cancelable biometric schemes for Euclidean metric and Cosine metric
Notations | Descriptions |
|---|---|
w | Feature vector |
u | Hashcode vector |
U | The set of sub-vectors of hashcode vector |
d | The sub-vector length in Cosine LSH-based scheme |
v | Protected template |
n | The length of feature |
N | N-to-one mapping |
l | The length of template |
k | The number of LSH times |
I | The vector consisted of k LSH outputs |
M | Prime number |
A, B | Tokens (secret key) of the user |
\(h(\cdot )\) | Locality sensitive hashing (LSH) |
c | Parameter of Euclidean LSH |
x, y | Parameters of LSH |
\(\tau\) | Threshold |
\(hd_{nor}\) | The normalized hamming distance between protected templates |
S | The similarity score between protected templates |