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The using of binary affine transformation for simultaneous encryption-decryption of two images the same dimension that are clearly marked internal contours.
A new encryption scheme for digital images based on compound Chaos algorithm is presented in this paper. The compound Chaos algorithm combines the Lorenz Chaotic system and Logistics map to generate the pseudo-random sequences. Then the pseudo-random sequences are used to produce the permutation matrix to encrypt the digital image. Matlab is used for simulation testing of the image encryption. Algorithm...
Information security is an important issue. Today's encryption technologies can be traced back to the earliest ciphers, and have grown as a result of evolution. The first ciphers were cracked, so new, stronger ciphers emerged. Code breakers set to work on these and eventually found flaws, forcing cryptographers to invent better ciphers and so on. Hill Cipher is one of the most famous symmetric cryptosystem...
In this paper, an optical cryptosystem with adaptive steganography is proposed for color image encryption and decryption. The optical cryptosystem employs a double random phase encoding algorithm to encrypt and decrypt color images. The color image is first separated into three channels: red, green, and blue. Each channel is encrypted by two random phase masks generated from session keys. For higher...
In this paper new partial encryption schemes are present, in which a secure encryption algorithm is used to encrypt only part of the images. Only part of the original data is encrypted for two different grayscale images and two color images of size (256 times 256) pixels, resulting in a significant reduction in encryption and decryption time.
In the past decade, a number of image encryption algorithms based on chaotic maps have been proposed. Recently, an image encryption algorithm based on chaotic map lattice (CML) is proposed that allows direct encryption and decryption of color digital images. In this paper, we propose an enhanced CML based algorithm for image encryption to improve the security of the algorithm. The performance of the...
A novel scheme for the embedding XML file in a 24-bit BMP color image using steganographic technique is presented in this paper. The lab color space is used instead of the RGB color space which is found to be more suitable for watermarking application. The XML file that is to be embedded is encrypted by providing a password and decrypted during watermark detection phase. The watermark detection process...
This paper presents three simple methods alternatives to visual cryptography for colored images. In the first method, an RGB colored image is converted to HSI image generating 8 sub-images. Then each sub-image is divided to an arbitrary number of slides (8 slides) sub-images and encrypted using XOR operation with HSI random keys. A substitution process is applied for decryption followed by HIS/RGB...
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