一种安全的移动自组网链路状态路由协议：SOLSR

移动自组网是一种新型的无线移动网络，具有无中心、自组织、拓扑结构变化频繁以及开放式通讯信道等特性，因此移动自组网下的路由协议所面临的安全问题比有线网环境下更为严重。OLSR（Optimized Link State Routing）协议于2003年成为RFE3626草案，该协议首先假设网络中所有节点都是友好的，无恶意行为，同时认为安全问题可以利用IPSec来解决，但是，OLSR协议的通讯通常是“一对多”的广播形式，IPSec是针对端到端通讯的安全方案，故而单单依靠IPSec并不能完全解决OLSR的安全问题。由于OLSR自身还存在着机制上的漏洞，恶意节点针对这些漏洞进行攻击，可以导致路由协议无法正常工作，继而影响到整个网络的运行。本文在对OLSR的安全性分析的基础上，对协议进行了改进，加强了协议中对“邻居关系”的定义，同时引入了虫洞检测和身份认证机制，以及通讯报文的安全附加项，从而提出了安全链路状态路由协议——SOLSR来保证移动自组网中路由协议的正常运行。

SOLSR: A Secure Link State Routing Protocol for Ad Hoc Networks

Mobile Ad hoc Netwoks(MANET)is a new networking paradigm for wireless hosts. Because of self-organi- zation, dynamic topology and openness of wireless links, the routing security in MANET is more seriously than in wired networks. Optimized Link State Routing(OLSR)is proposed by IETF's MANET Group at 2003. OLSR assumes that all nodes in the netwoks are all friendly, and if there exist some security problems, IPSes can solve it. But OLSR's packets are often broadcasted and IPsec provides end-to-end security, so relying on IPSec isn't enough. Due to some existing defects, OLSR may not work if malicious nodes attack against routing. In this paper, we first analyze the OL- SR's security, then propose a solution to secure OLSR -- SOLSR, which strengthenes the neighbor relationship estab- lishment, applies the worm-detective mechanism and autheetication, and protects routing information.