A block-based transformation algorithm is proposed for image security using a combination of image transformation and encryption techniques. This algorithm will be used as a pre-encryption transform to confuse the relationship between the original images and the generated ones. The generated (transformed) images are then fed to the Blowfish encryption algorithm. Correlation, histogram, and entropy have been used to measure the security level of the images.

AN_APPROACH_TO_ENHANCE_IMAGE_ENCRYPTION_USING_BLOCKBASED.pdf

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