Aiming at the multi-channel power allocation problem of the communication system with a fix transmitting rate, which is undergoing intelligent jamming attack, an asymmetric Colonel Blotto game model was proposed. Under the condition of complete information, the equivalent optimal power allocation strategies at a single channel were deduced for the communication system and the jammer. Moreover, the only mixed Nash equilibrium strategy of them was proved, and the Nash equilibrium benefit was acquired. Based on the equivalent optimal power allocation strategies at a single channel, a direct column element exchange algorithm by multiple scanning was proposed to construct the multi-channel mixed power distribution matrix, which could adapt to more channels and wider power distribution range than the linear programming method. Through numerical simulation, the effectiveness of the multi-channel mixed power allocation matrix construction algorithm and the optimality of the proposed power allocation strategies were verified.

Aiming at the problems of low reconciliation efficiency and key leakage of the classical Cascade protocol, an improved Cascade protocol aided by fluctuation error quantization was proposed. Before reconciliation, the statistical characteristics of the fluctuation difference of channel magnitude feature of legitimate nodes were studied and a fluctuation error quantization method was proposed by using it. Based on the proposed quantization method, an improved Cascade protocol was designed by parity grouping and partitioning reconciliation. Numerical results demonstrate that the proposed improved Cascade protocol effectively improve the reconciliation efficiency, reduces the computational complexity required for information reconciliation and the possibility of key information leakage at the cost of partial reconciliation success rate. In addition, compared with the existing key generation schemes, the key generation scheme based on the proposed improved Cascade protocol has a lower key inconsistency rate and a higher key generation rate.