Traditional access control is not fit for these systems.
传统的访问控制机制不能很好地适用于这些系统。
Traditional access control models, including MAC model and DAC model, have no longer been able to meet the security need of contemporary systems.
传统的访问控制模型——MAC模型和DAC模型，已远不能满足当代系统安全的需要。
As P2P system is inherently decentralized and open, some traditional access control and authentication approaches cannot be adapted in P2P system.
由于P 2 P系统具有分布性、开放性等特点，传统的访问控制和认证的方法不能很好地在P 2 P系统中适用。
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