Dynamical cryptography based on synchronised chaotic systems

Recently, a novel dynamical data encryption system based on synchronised ch aotic systems was proposed For security communication. Based on the same sy nchronised chaotic systems, its dynamical cryptography is investigated. In this system, the ciphertext of each bit is mapped to one of two distinct ch aotic dynamical equations. The ciphertext can be decrypted by its synchroni sed chaotic equation. This method can prevent intruders From recovering the information signals by statistical methods. To demonstrate its effectivene ss, a 2 bit dynamical data cryptosystem based entirely on the Lorenz system is presented.