5 (b) shows an example of inserting chaffs using direction 6, and Fig.
For each user's minutia, the chaffs are inserted along the line by adding/subtracting [DELTA]x and [DELTA]y to/from the x-y coordinates of the minutia.
The average number of minutiae was 30, and we inserted about 200, 300, and 400 chaffs, respectively.
the chaffs are generated by using the user's minutiae direction information) with that of random chaff insertion approach (i.
Additionally, to avoid the correlation attack against the fuzzy vault, we applied an approach to insert chaffs in a structured way such that distinguishing the fingerprint minutiae and the chaff points obtained from two applications is computationally hard.
Security Verification Accuracy Brute-force Correlation About 300 chaffs Attack Attack FAR FRR Random Insertion 2.
i])) and some large number of chaff points ([[alpha.