本文针对随机错误和突发错误并存的信道,提出了用级联码来构造公钥密码体制的原理和方法。通过对这种体制的安全性、可靠性、码率及实现复杂性等的分析,指出了这种体制有足够高的安全性,有极强的抗干扰能力,且实现复杂性与M_3公钥相近,但它的码率较M_s公钥低,这也说明了在保密通信中,码率与安全性、可靠性是相矛盾的。 In this paper, for the coexistence of random errors and burst errors, the principle and method of constructing public-key cryptosystem with concatenated codes are proposed. By analyzing the security, reliability, bit rate and implementation complexity of this kind of system, it is pointed out that this kind of system has enough security, strong anti-interference ability, and the complexity and M_3 public key But its code rate is lower than that of M_s public key, which also shows that in secure communication, code rate is contrary to security and reliability.