Application of discrete chaotic dynamical systems in cryptography - DCC method

In the paper we propose a method of constructing cryptosystems, utilizing a nonpredictability property of discrete chaotic systems. We point out the r equirements for such systems to ensure their security. The presented algori thms of encryption and decryption are based on multiple iteration of a cert ain dynamical chaotic system coming from gas dynamics models. A plaintext m essage specifies a part of the initial condition of the system (a particle' s initial position). A secret key specifies the remaining part of initial c ondition (the particle's initial angle) as well as a sequence of discrete c hoices of the pre-images in the encryption procedure. We also discuss probl ems connected with the practical realization of such chaotic cryptosystems. Finally we demonstrate numerical experiments illustrating the basic proper ties of the proposed cryptosystem.