Safer parameters for the Chor–Rivest cryptosystem

Vaudenay’s cryptanalysis against Chor–Rivest cryptosystem is applicable when the parameters, pp and hh, originally proposed by the authors are used. Nevertheless, if pp and hh are both prime integers, then Vaudenay’s attack is not applicable. In this work, a choice of these parameters resistant to the existing cryptanalytic attacks, is presented. The parameters are determined in a suitable range guaranteeing its security and the computational feasibility of implementation. Regrettably, the obtained parameters are scarce in practice.