An Efficient Image Block Encryption for Key Generation using Non-Uniform Cellular Automata

Abstract

Cryptographic image block encryption schemes play a significant role in information enabled services. This paper proposes an image block encryption scheme based on a novel three stage selection (TSS) method in a public cloud with reversible cellular automata. Due to the openness of public cloud, different attacks are possible over user sensitive information. The TSS method has three stages and they generate a robust master key with user plaintext as input and produces an encrypted block as key to be sent to authenticated users. An analysis of experimental results shows that this new method has a large key space and immune to brute force attacks, statistical cryptanalysis attacks and chosen plaintext attacks. Also, the encrypted image entropy value could be increased to 7.9988 making it ideal for a best image block encryption for key generation.

Privacy‐preserving in the smart healthcare system using steganography and chaotic functions based on DNA

“…Then the blocks are merged; finally, the final image is produced. [22][23][24][25] In recent years, many algorithms based on chaotic functions have been offered that have been accepted by researchers due to their sensitivity to initial values and randomness. In many images' cryptography and steganography techniques, pseudorandom numbers are used to choose or displace pixels or blocks those chaotic functions are used to create these pseudorandom numbers.…”

“…In these techniques, the image is divided into several blocks; moreover, the desired processing is conducted on each block independently. Then the blocks are merged; finally, the final image is produced 22–25 …”