Encryption and decryption of Grayscale and Colour MRI Medical Images Using Scrambling Algorithm

Abstract

Considering the rapid development of digital communications technologies and the massive distribution of multimedia images, the need to prevent sensitive content of images to unlawful use has become a core requirement. The same can be applied to medical imaging, as intensity values and spatial positioning of adjacent pixels are strongly interdependent. The described technique modifies the natural pixel correlation by increasing the positional and intensity entropy with the help of row and column permutation. Experimental tests proved that the algorithm is able to encode and decode pictures with a private key without any danger. Even though the encryption algorithm is computationally efficient and easy to execute, it is invulnerable to possible cryptographic attacks. The investigation utilized a range of performance indicators, such as Encryption Duration (ET), Decryption Duration (DT), and the Information Entropy of the original image (Eo).