Secure Broadcasting Using Independent Secret Keys
Secure Broadcasting Using Independent Secret Keys
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DOI：
10.1109/tcomm.2017.2764892
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发表时间：
2018-02-01
影响因子：
8.3
通讯作者：
Poor, H. Vincent
中科院分区：
文献类型：
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作者：
Schaefer, Rafael F.;Khisti, Ashish;Poor, H. Vincent
研究了具有独立密钥的安全广播问题。特定的情况下进行了分析，其中一个共同的消息必须广播到两个合法的接收器，而保持外部窃听者无知的it.The发送器共享独立的秘密密钥足够高的速率与两个合法的接收器，这可以用在不同的方式：他们可以被用来作为一次性垫加密的共同消息，作为虚构的消息窃听编码，或作为这些的混合。在本文中，容量的结果建立时，涉及三个接收器的广播信道退化。如果这两个合法的信道是窃听者的信道的降级版本，它表明，一次性垫的方法是最佳的几种情况下，产生相应的容量表达式。或者，窃听编码的方法被证明是最佳的，如果窃听者的信道相对于两个合法的信道，建立在这种情况下的能力，以及退化。如果窃听者的信道既不是最强的，也不是最弱的，一个复杂的方案，仔细结合了一次性密码本和窃听编码与虚构的消息的概念，原来是实现容量。最后，我们也得到了一般的非退化广播信道的一些结果。
The problem of secure broadcasting with independent secret keys is studied. The particular scenario is analyzed in which a common message has to be broadcast to two legitimate receivers, while keeping an external eavesdropper ignorant of it. The transmitter shares independent secret keys of sufficiently high rates with both legitimate receivers, which can be used in different ways: they can be used as one-time pads to encrypt the common message, as fictitious messages for wiretap coding, or as a hybrid of these. In this paper, capacity results are established when the broadcast channels involving the three receivers are degraded. If both legitimate channels are degraded versions of the eavesdropper's channel, it is shown that the one-time pad approach is optimal for several cases, yielding corresponding capacity expressions. Alternatively, the wiretap coding approach is shown to be optimal if the eavesdropper's channel is degraded with respect to both legitimate channels, establishing capacity in this case as well. If the eavesdropper's channel is neither the strongest nor the weakest, an intricate scheme that carefully combines both concepts of one-time pad and wiretap coding with fictitious messages turns out to be capacity-achieving. Finally we also obtain some results for the general non-degraded broadcast channel.