Novel orbit based symmetric cryptosystems

During the last few years considerable effort has been devoted to research related to chaotic encryption. In this paper a new symmetric key cryptosystem that exploits the idea of nonlinear mappings and their fixed points to encrypt information is presented. Furthermore, a measure of the quality of the keys used is introduced. The experimental results indicate that the proposed cryptosystem is efficient and secure to ciphertext—only attacks. Finally, three modifications of the basic cryptosystem that render it more robust are presented and efficiency issues are discussed.