This paper introduces a new concept for image encryption using a binary Â¿key-imageÂ¿. The key-image is either a bit plane or an edge map generated from another image, which has the same size as the original imageto be encrypted. In addition, we introduce two new lossless image encryption algorithms using this key-imagetechnique. The performance of these algorithms is discussed against common attacks such as the brute force attack, ciphertext attacks and plaintext attacks. The analysis and experimental results show that the proposed algorithms can fully encrypt all types of images. This makes them suitable for securing multimedia applications and shows they have the potential to be used to secure communications in a variety of wired/wireless scenarios and real-time application such as mobile phone services.
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