Secure Method for Biometric-Based Recognition with Integrated Cryptographic Functions

Table 3

Notations.

Notations	Meaning
𝑡	Threshold value
𝑝	The interval of the quantitative mode
𝑤/𝑤^′	Biometric feature extraction data
𝑤𝑞/𝑤^′𝑞	Data after value quantization
𝑤𝑎	Fine-tuned values
ID𝐴	The ID of user A
PK𝐴	The public key of user A
𝑊𝐸	Internal registered biodata to be recognized
𝑊𝐼	Input biodata for matching the internal biodata
𝑊𝐸^(𝑗)/𝑊𝐼^(𝑗)	𝑊𝐸/𝑊𝐼 in the stage j
𝑊^(𝑗)𝐸𝑖/𝑊^(𝑗)𝐼𝑖	Related data value of the ith point of 𝑊𝐸^(𝑗)/𝑊𝐼^(𝑗)
cert𝐴	Certificate of user A
time	Validity period of certificate
𝑛𝐴	Product of two large primes as A’s parameters
ℎ(⋅)	Cryptographic one-way hash function
⌊⋅⌋	Floor function
[⋅]PK	Encryption function using public key PK
sigSK(⋅)	Signature using private key SK