Design and implementation proposed system for encryption true images
Asst. Prof. Dr.Baheja K.Shukur · IOSR Journal of Engineering · 2013
Image encryption method prepared information unreadable.Therefore, no hacker or eavesdropper, including server administrators and others, have access to original message or any other type of transmitted information through public networks such as internet.This paper presented a secure encryption method for true image encryption, which gets the benefits of both methods (symmetric and asymmetric encryption methods); a hybrid technique is usually used.In this technique, asymmetric encryption (RSA) is used to encrypt the security message the resulting cipher text is converted to binary form then symmetric encryption designed to encrypt the resulted cipher bits by making XOR operation with it.The design of symmetric key provides good confusion and diffusion properties that ensures high security.The easiest way to do this is through the design of the strong threshold linear feedback shift register, where the R,G,B bytes is ciphered with a single distinct bit generated from making XOR operation between key generator and resulting binary cipher bits ,which made the ciphers are more complex, the key is said to be well designed and its size provides an upper bound of an algorithm's cryptographic strength ,which consist of four shift registers the length them are 12,10,7,5 respectively, three of them are linear and the other are nonlinear,also the design of the linear feedback function very strong ,which provided maximum length period.The opposite operation is performed to reconstructed the original image and the original secure message .inaddition to that different measured have been used to explain the range of the difference between the regional and cipher images and to show the power of the encryption methods, such as histogram, Calibrated area, Mean, Standard deviation, Median, Calibrated center of mass , Calibrated perimeter, and Calibrated ferret diameter.