Optical image encryption using radon transform

The need to secure data and information has been increasing to prevent the unauthorized usage. Important data needs to be secured efficiently to protect it from the various security threats and attacks. The optical image encryption techniques have distinct advantage of processing complex two-dimensional information in parallel with high-speed. The optical systems with its multidimensional capabilities possess many unique characteristics such as securing information with various degrees of freedom. In this paper, we have proposed a novel optical image encryption algorithm using Radon Transform in the optical domain. Radon Transform is a mechanism which is used to express the projections of the image. It can be used in the optical encryption systems to enhance their security by increasing the security parameters of the system. It adds an additional security layer to the images and makes the encryption system difficult to be attacked. The technique is robust and can be used to transmit data securely. Simulation results are presented to validate the proposed idea. Reliability of the technique has been established by evaluating the mean-square error (MSE) and correlation coefficient (CC) values between the decrypted and the original images.