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Design and implementation of Threefish cipher algorithm in PNG file

Ahmed S. Nori, Ansam O. Abdulmajeed

Abstract: This paper is presenting design and implementation of Threefish block cipher on grayscale images. Despite the fact that Threefish block cipher is one of the best secure algorithms, most studies concerning Threefish have focused on hardware implementation and have not commonly been applied on image encryption due to huge amount of data. The main contribution here was to reduce the time and the amount of data to be encrypted while maintaining encryption performance. This objective was achieved by encrypting just the most significant bits of image pixels. A 256-bit plain text blocks of the Threefish was constructed from 2n most significant bits of the pixels, where 0
Keywords: encryption / cipher / good / implementation / Threefish block / encrypted / bits / differential

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