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In this paper, the authors introduce a novel steganography-based approach to protect the iris data by hiding it into a digital image for personal identification purpose. Transformations are done to encrypt the biometric data before hiding. JPEG quantization blocks in diagonal sequence are investigated for exploring an efficient hiding algorithm with high transparency and strong robustness. The extraction of iris data does not require original image and provide high accuracy under different attacks. Experimental results show that this proposed method improves the security of the iris-feature with hardly detectable decrease in recognition performance.
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