Analysis of the Quality of Insar Images Encrypted by the Feistel Network-Based Cryptosystem Using the CFB mode

The risk of compromising data confidentiality and quality during transmission, especially in the case of images, has led to the use of various encryption algorithms to secure transmitted images while ensuring their original quality. Satellite images, in particular, often have large volumes and high redundancy. Considering that satellites operate within strict limits in terms of computing power and resources, their operation in harsh environments can introduce radiation-induced defects in onboard electronics, including encryption systems.The objective of our work is to analyze the quality of a specific type of satellite image, which is Interferometric synthetic aperture radar (InSAR) interferogram, encrypted using a Feistel network-based cryptosystem with Cipher FeedBack (CFB) mode. Several metrics are used for this analysis, based on objective methods using a complete reference image, which consists of two original interferograms. The quantitative measures employed include Structural Similarity Index (SSIM), SHA-256 hash function, Mean Squared Error (MSE), Peak Signal-to-Noise Ratio (PSNR), and statistical analysis such as encrypted interferogram histogram analysis.