A Novel Approach for Medical Image Encryption Using Multiple Chaotic Maps and DNA Diffusion Operations

Abstract

Due to advancement in electronic interaction, the broadcast of a medical image is very common. The electronic interaction is open to very one and hence, it is risk for medical image communication. The communication of medical image through opensource network adds uncertain risk of undesirable effect and causes important disease related facts in the image being lost or corrupted. For medical practitioner, diagnos- ing the correct disease from the lost or corrupted medical image. Hence high-level security and verifying integrity is very essential. A new cryptosystem based on DNA cryptography and multiple high dimensional chaotic maps and SHA-256 is proposed to deliver high-level security and verify integrity. The medical image is divided into two subimages. The subimages are converted into DNA synthesis using dynamic DNA coding rules. The hash keys are generated for both DNA synthesis using SHA-256. The Chen’s chaotic sequences are utilized to permute the pixels of DNA synthesis of subimage one. Another DNA synthesis of subimage two are permuted using Lorenz chaotic sequences. The hash keys are XORed with chaotic sequences. The DNA diffusion operation diffuses the pixels of the DNA synthesis. The dynamic DNA decoding rules are used to get cipher image. The simulation outcomes prove that the proposed cryptosystem is suitable to pro- vide high-level security and integrity. The cryptanalysis confirms that proposed system is invulnerable to var- ious types of attacks.