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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...
For the original article see ibid. vol.27, p.228-9, 1991. This comment is in response to this letter by Da-Xing Li in which it is claimed that 'public-key distribution systems based on Dickson polynomials are insecure no matter how the system parameters are chosen and no matter how the Dickson polynomials are calculated.' The claim is based on an attack which can be executed in no more than the square...
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