中文摘要：

多来源网络编码允许中间的节点线性地从多重来源联合包，但是它对能引起多重下游的数据被弄脏的污染攻击脆弱。解决这个问题，我们利用格子签名和同构的性质造安全多来源网络编码计划。借助于格子基础代表团算法，我们的计划能产生一个公共格子因为所有来源节点和同构的签名能在这个格子上是计算的。因而，仅当所有来源节点总体上被考虑，多来源签名问题能被转变成单个来源的签名问题。计划分析显示出正确性和建议计划的同构的性质。

英文摘要：

Multi-source network coding allows intermediate nodes to linearly combine packets from multiple sources, but it is vulnerable to pollution attacks which can cause multiple down- stream data to be polluted. To solve this problem, we take advan- tage of lattice signature and homomorphic property to build a se- cure multi-source network coding scheme. By means of the lattice basis delegation algorithms, our scheme can generate a public lattice for all source nodes and the homomorphic signatures can be calculated on this lattice. Consequently, the multi-source signature problem can be transformed into single-source signature problem only if all source nodes are considered as a whole. Scheme analy- sis shows the correctness and homomorphic property of the pro- posed scheme.