Abstract
Image encryption is an important and effective technique to protect image security. In this paper, a novel image encryption algorithm combining Julia sets and Hilbert curves is proposed. The algorithm utilizes Julia sets’ parameters to generate a random sequence as the initial keys and gets the final encryption keys by scrambling the initial keys through the Hilbert curve. The final cipher image is obtained by modulo arithmetic and diffuse operation. In this method, it needs only a few parameters for the key generation, which greatly reduces the storage space. Moreover, because of the Julia sets’ properties, such as infiniteness and chaotic characteristics, the keys have high sensitivity even to a tiny perturbation. The experimental results indicate that the algorithm has large key space, good statistical property, high sensitivity for the keys, and effective resistance to the chosen-plaintext attack.
Highlights
With the increasingly wide reach of the Internet, communications via Internet are getting more frequent
Image encryption has been a focus in the research of information security
Most conventional encryption algorithms put the emphasis on text data or binary data
Summary
With the increasingly wide reach of the Internet, communications via Internet are getting more frequent. The algorithm uses several parameters to generate the keys with the same size as the plain images and has a good efficiency in the encryption.
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