Ahmed A. Abd El-Latif

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Recently, several cryptosystems based on chaos have been proposed. Nevertheless, most of them hinder the system performance, security, and suffer from the small key space problem. This paper introduces an efficient symmetric encryption scheme for secure digital images based on a cyclic elliptic curve and chaotic system that can overcome these disadvantages.(More)
In this paper, a novel method to verify the infrared finger-vein patterns is proposed for biometric purposes. Firstly, we select parameters for Gabor filter with eight orientations to exploit finger-vein network, then we extract vein patterns by the fusion of two distinct orientation results. Secondly, we utilize SIFT features to offset the effect of images(More)
In this paper, a visual secret image sharing threshold scheme based on random grids and Boolean operations with the abilities of AND and XOR decryptions is proposed. When no light-weight computation device the secret could be revealed by human visual system with no cryptographic computation based on Boolean AND operation (stacking). On the other hand, if(More)
Iris recognition plays an important role in biometrics. Until now, many scholars have made different efforts in this field. However, the recognition performances of most proposed methods degrade dramatically when the image contains some noise, which inevitably occurs during image acquisition such as reflection spots, inconsistent illumination, eyelid,(More)
Recently, a number of chaos-based image encryption algorithms have been proposed. However, the initial parameters used in masking operation are usually fixed in the whole encryption process. In this paper, we introduce an efficient image encryption scheme of pixel bit based on combination of chaotic systems with variable initial parameters. The algorithm(More)