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本文叙述了(K,N)门限通信密钥分散保管((K,N)TCSS)系统的原理和要求,以及用CR(中国剩余定理)码和RS码构造的(K,N)TCSS系统的一般方法和存在的问题。针对这些问题,提出了利用级连码构造的(K,N)TCSS系统,分析了该系统的性能和优缺点。指出利用级连码构造的系统,不仅具有(K,N)TCSS系统所要求的性能,并且能确认掌握子密钥人员的合法性,防止子密钥的窜改和对主密钥的破坏,在计算量上也比用CR码构造的系统要小。
This paper describes the principles and requirements of the (K, N) TCSS system and the (K, N) TCSS system constructed with CR (Remainder Theorem) code and RS code General methods and problems. In response to these problems, the (K, N) TCSS system constructed by using cascaded codes is proposed and its performance, advantages and disadvantages are analyzed. It is pointed out that the system constructed by using cascaded codes not only possesses the performance required by (K, N) TCSS system but also can confirm the legitimacy of the subkey and prevent the tampering of the subkey and the destruction of the master key. The amount of computation is also smaller than the system constructed with the CR code.