Why we need pixel data encryption (perceptual encryption), not the complete file encryption (conventional encryption)?
I am working on securing medical images, but I could not find the answer to this question. Is the complete encryption of the file (image pixel data+ metadata(header file)) better than encrypting only pixel data (distorted image) which preserve the header information (codec information) of the encrypted image?
In the literature, I found the following: Security mechanisms developed in the existing digital medical image systems are mostly based on the conventional encryption techniques such as DES, AES, IDEA, RSA. These mechanisms have been widely recognized as the standard multimedia encryption mechanisms. However, conventional mechanisms have obvious limitations on the multimedia data such as images shown in the following papers:
- Socek D, Magliveras S, C’ulibrk D, Marques O, Kalva H, Furht B. Digital video encryption algorithms based on correlation-preserving permutations. EURASIP J Inform Security 2007.
- Yoon, Ji Won, and Hyoungshick Kim. "An image encryption scheme with a pseudorandom permutation based on chaotic maps." Communications in Nonlinear Science and Numerical Simulation 15.12 (2010): 3998-4006.
- Pareek, Narendra K., and Vinod Patidar. "Medical image protection using genetic algorithm operations." Soft Computing 20.2 (2016): 763-772.