Abstract
Mobile agent technology has been proposed for use on the Internet. The mobile agent is a software program that acts on behalf of a user or software. It has the following features: (1) it is autonomous; (2) it has one or more objectives; (3) it has a scope of competence; and (4) it may, or may not, collaborate and communicate with other software and users. 3 In order to perform its job, it is able to migrate from a source host to a target host on a network under its own control. 4 However, this may lead to a great deal of security threats and attacks. When a mobile agent moves between a series of hosts, it may happen to encounter either trust-worthy or malicious hosts. A mobile agent must be capable of authenticating legal hosts and other agents to avoid malicious attacks. Ideally, a mobile agent should be versatile, robust, and secure in changing environments. Therefore, the security issue when dealing with mobile agents becomes essential. So far, the research on mobile agent security has been focused on the following topics: 5
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