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In the mobile agent system, the authentication and identity delegation of mobile agents are the important security problem. This paper focuses on the issues faced by a relying party when deciding to trust a CA and the certificates that it issues. The scope of this paper is limited to examining the basis for trusting a relying party places in an identity certificate signed by a CA. Some of the working group's discussion of the authentication and delegation of identity of mobile agent are also presented. This paper also gives a way to protect private keys and identity certificates in the mobile agent environment. The mobile agent and agent platform can use these certificates to build trust relationships between the CA and its registration authorities, or trust relationships between the end entities and the service providers.