Cryptanalysis of public-key distribution systems based on Dickson polynomials

Yang Yi-Xian (1987) presented a public-key distribution system based on Dickson polynomials. V. Varadharajan, (1989) commented on it and showed that the choice of parameters of such a system is quite significant in its design. In this Letter, it is pointed out, by analysing the computational complexity of this system, that this system is insecure no matter how the system parameters are chosen and no matter how the Dickson polynomials are calculated.