An Improved Chaos Based Medical Image Encryption Using DNA Encoding Techniques

Medical Image protection is one of the primary concerns of health care services. There has been a lot of research in this field in the past decade. But unfortunately, in India, the implementation is very poor and unstructured. In this paper, a secured model for MRI image encryption and decryption using DNA Encoding and Logistic Chaotic Map is proposed. Initially a key is generated using logistic map function to generate a sequence K1,i this sequence is multiplied with a factor of 255, another sequence K2,i generated from Linear Feedback Right Shift Register (LFRSR) using an initial seed value, then both the sequences are XORed to form the key. After the key is generated the sequence is again XORed with the 8-bit image pixel of the MRI Image. The generated cipher is then converted into a DNA sequence using DNA Encoding. The generated text of DNA sequence is then passed to the network. This sequence is extremely secure and robust, the Root Mean Square Error (RMSE) value measured between the original and encrypted sequence is very high.