Abstract
Establishment, evolution and evaluation of Internet-scale software system initialization and evolution for trust relationship among entities is researched. An Internet-scale software system structure model is established by structure analysis. A hierarchical Petri nets model for evaluating dependability is proposed based on the Internet-scale software system structure model. The model evaluates dependability evolution of Internet-scale software from system architecture of the whole system and internal access control policies of entities. The proposal provides support for trust measurement and evolution model of Internet-scale software to dependability of system initialization and newly created entities. Additionally, the proposal provides mechanism for server entities to establish trust to client entities.