Although some other groups have brought forward many solutions, there exist many deficiencies that cause them to be utilized difficultly and insecurely.

• 尽管相关的研究团体也提出了一些解决方案，可是由于没有切实把握住网格的特点，通过研究，发现这些技术有着较多的不足，难以满足网格这个特殊环境的需求。