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International audienceMobile Agents are autonomous software entities able to move from one host to another. However, this mobility is not all the time safe, as a hosting platform may receive agents with malicious behaviors. In this paper, we attempt to deal with this security problem by proposing a solution based on a strengthened cryptographic authentication and an access control policy. The proposed authentication process is performed through a resistant MITM Diffie-Hellman key exchange protocol, while the resources access control policy is elaborated basing an enhanced DAC model where Shamir-Threshold Scheme is used to manage and share access rights. We have conducted detailed experiments and practical investigations to evaluate the security of our approach and its effectiveness to resist face to some well known attacks