中文摘要：

网络编码通信系统的防搭线窃听安全实现策略始终存在着通信开销大、计算复杂度高等性能方面的缺点。为了探求高效网络编码环境下的防窃听安全方案，首先利用伪随机置换来局部随机化信源发送的任意一个明文消息向量，然后将该被随机化的向量与剩余的明文向量进行随机线性混淆。分析和实验比较表明，该方案占用的带宽资源少，具有较低的编码复杂度和较好的传输性能，并且能在应用中与现有安全技术进行有效融合。

英文摘要：

All existing schemes to secure network coding against wiretapping either bear significant bandwidth overhead or high computational coding complexity. An efficient solution is exploited for network coding appli- cations in this paper. The key idea is first to randomize one of source message vectors by using a pseudo-ran- dom permutation, and then randomly mix up the remaining message vectors with the randomized one. Analysis and simulation demonstrate that the proposed method has properties of lower coding complexity lower additional bandwidth resource, and better transmission performance compared to the existing schemes, and can be effec- tively integrated with existing cryptography tools.