Multi-Agent Secure Communication Protocol

Proposes a multi-agent secure group communication architecture and corresponding secure group communication protocols to ensure the confidentiality,integrity,authenticity and non-repudiation of group communication message.Proposes three multi-agent group re-keying protocols to ensure each agent to have the latest group key.Extends the base knowledge query and manipulation language(KQML) to support multi-agent group re-keying protocols and secure group communication protocol.