复合窃听信道的安全容量

Security Capacity of Compound Wiretap Channel

在Wyner窃听信道和复合信道的基础上,考虑了合法传输信道集为经典信道,窃听信道集为量子信道这种信道模型的信息传输能力。目标是要设计编码译码方案,使得接收方能够完美译出发送的消息(译码错误概率趋于0),同时窃听者对发送消息的疑惑度尽可能的高。在此基础上推导了在发送者知道信道状态信息的情况下有量子窃听时的经典复合信道的安全容量;同时得出了在发送者不知道信道状态信息的情况下这种信道的安全容量的下界。

Based on Wyner tapping channel and the composite channel, the information transmission ability of a channel is considered in which legitimate transmission channel set is a classical channel and wiretap channel set is a quantum channel. The goal is to design coding and decoding scheme, so that the receiver can decode the message sent by the sender perfectly （decoding error probability close to zero）, while the degree of confusion of eavesdropper to messages is as high as possible. On this basis, it is guaranteed that in the case of Alice＇ s knowing of information of channel condition, there is the security capacity of classic composite channel when quantum wiretaps; at the same time, the lower bound of security capacity of this channel is known in the case of Alice＇s unknowing of information t of channel condition.