【摘 要】
：
Certificate Authority (CA) is the core of public key infrastructure. However, the traditional structure of CA is either hierarchical or reticular, and none of t
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Certificate Authority (CA) is the core of public key infrastructure. However, the traditional structure of CA is either hierarchical or reticular, and none of them is suitable for security requirements come from the new trend in enterprise cooperation, namely virtual enterprise (VE). In this paper a new idea - virtual certificate authority (VCA), is proposed, as well as its implementation. The goal of VCA is to provide global certificate service over vital enterprise while keeping CA of each participant intact as much as possible. Unlike PEM, PGP, and BCA, by using secret sharing scheme, virtual CA avoids the need for TTP and supports virtual enterprises feature of dynamical construction and destruction.
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