2Foster I,Kesselman C,Tsudik G,Tuecke S. A security architecture for computational grids[EB/OL]. http://www. gridcomputingplanet. com/opinions/article. php/1008821.
3Siebenlish F, et al. OGSA security roadmap global grid forum specification roadmap towards a secure OGSA[EB/OL]. http://www. gridforum. org/meetings/ggf6/ggf6_wg_papers/draft-ggfogsa-sec-roadmap-01. doc.
4Thompson M R,et al. CA-based trust model for grid authentica tion and identity delegation [EB/OL]. http://www. gridforum.org/meetings/ggf6/ggf6_wg_papers/IBM/TrustModel-v6c. pdf.