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摘要: 为了改善指纹模板保护算法的可撤销性、不可逆性等性能, 设计了一种基于细节点投影的可撤销指纹模板生成算法.首先对指纹图像进行预处理, 提取指纹的细节点特征, 并筛选出采样半径范围内的有效细节点, 然后对细节点进行直线投影, 将投影后的向量映射到二维网格, 生成固定长度的一维比特串, 再结合用户PIN码生成可撤销指纹模板.在指纹数据库FVC2002-DB1和DB2上的实验结果表明, 该算法不仅提高了指纹模板认证的稳定性, 而且在可撤销性、不可逆性和安全性等方面均具有较好性能.Abstract: In order to enhance the revocation and irreversibility performance of the fingerprint template protection algorithm, a cancelable fingerprint template generating algorithm is proposed using minutiae projection. Firstly, we extract fingerprint minutiae feature after preprocessing the fingerprint image and select the effective minutiae within the range of the sampling radius. Next, we project the minutiae into a line and map the projected vectors onto a 2D grid to generate a fixed length 1D bit-string. Finally, the cancelable fingerprint template is generated by combining the user PIN code. Experiments performed on FVC2002-DB1 and DB2 show that the algorithm not only improves the stability of the template authentication but also satisfies revocation as well as non-invertibility, and ensures the security of the algorithm.
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Key words:
- Minutiae /
- projection /
- sample radius /
- cancelable template
1) 本文责任编委 左旺孟 -
图 2 基于细节点投影的可撤销指纹模板生成算法基本流程
Fig. 2 Process diagram of proposed method for fingerprint template generation
图 6 长$ = \sigma_{L}$、宽$ = \sigma_{\phi}$的二维网格阵列
Fig. 6 Two-dimensional array with cell size $\sigma_{L}, \sigma_{\phi}$
图 8 PIN码泄露时真假匹配分布
Fig. 8 Genuine and imposter distributions in the stolen-PIN scenario
图 9 PIN码泄露时本文算法和Pambudi方法的ROC曲线图
Fig. 9 ROC curves of Pambudi method and proposed method in the stolen-PIN scenario
图 11 在FVC2002-DB1和DB2中密钥安全、泄露的真假匹配分布
Fig. 11 Pseudo-imposter and cross (with same key) distributions for FVC2002-DB1 and DB2
表 1 不同参数的取值范围
Table 1 Parameter settings in the experiments
参数 参数描述 参数范围 $ t\_\min $ 最小采样半径 $ \{ 6, 7, \cdots, 13 \} $ $ t\_\max $ 最大采样半径 $ \{ 100, 110, \cdots, 160 \} $ $ c_{x} $ 网格单元的长 $ \{ 10, 11, \cdots, 15 \} $ $ c_{y} $ 网格单元的宽 $ \{ 8, 9, \cdots, 12 \} $ 
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表 2 不同参数在FVC2002-DB1下的EER (%)
Table 2 EER of different parameters for FVC2002-DB1 (%)
$ (t\_\min, t\_\max) $ $ (c_{x}, c_{y}) $ PIN码安全 PIN码泄露 (7, 100) (10, 8) 0 3.38 (13, 9) 0 3.63 (9, 120) (12, 9) 0 3.12 (14, 10) 0 3.37 (11, 140) (13, 9) 0 2.56 (13, 10) 0 3.14 (13, 160) (11, 11) 0 3.08 (12, 11) 0 3.18
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表 3 采用Pambudi方法和本文算法的性能比较(%)
Table 3 EER comparison between the Pambudi method and proposed method (%)
算法 PIN码安全 PIN码泄露 DB1 DB2 DB1 DB2 Pambudi等[18] $ - $ 1 $ - $ $ - $ 本文算法 0 0 2.5555 1.1565
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