Using a multi-scroll oscillator with an adjustable number of scrolls as chaos generator, this paper shows how an adequate control of the chaotic masking signal provides the basis for an improved security in private communication. We base the selection of the masking signal on two criteria...

The security of Fridrich's algorithm against brute-force attack, statistical attack, known-plaintext attack and select-plaintext attack is analyzed by investigating the properties of the involved chaotic maps and diffusion functions. Based on the given analyses, some means are proposed to...