In a distributed environment like the Internet, mobile agents can be employed to perform autonomous tasks such as searching and negotiating. However, for mobile agents to be widely accepted, performance and security issues on their use have to be addressed. In this paper, we propose a parallel dispatch model with secure route structures for protecting the dispatch routes of agents. This model facilitates efficient dispatching of agents in a hierarchical manner, and ensures route security by exposing minimal route information to hosts. To further enhance route robustness, we also propose a mechanism with substitute routes that can bypass temporarily unreachable hosts, using substitute hosts for deploying right dispatch branches and make later attempts to these failed hosts.
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