Mobile agents (MA) are autonomous software entities that are able to migrate across heterogeneous network execution environments. Mobility and autonomy compensate the deficiencies of distributed technology pretty well. But the security issues with mobile agents have not been solved and are becoming obstacles for the application of mobile agents. Homomorphic encryption is a technique in which the encrypted mobile codes can be executed directly on different platforms without decryption. This paper presents a protection scheme of mobile agent (AMHCFES) in network management application, which combining protect method of homomorphic encryption and composite function technology. The correctness and security proof of AMHCFES protection scheme are given in this paper, and malicious hosts can be avoided effectively using this scheme
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