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Root CA "B" trusts Intermediate CA "B1" which trusts Intermediate CA "A1" which is trusted by Root CA "A". And Intermediate CA "A1" also trusts Intermediate CA "B1". Which type of trust hierarchy model is this?
mesh
hybrid
hierarchical
bridge
These are the main types of trust models used with PKI: Hierarchical, Bridge, Mesh, Hybrid. The scenario includes both Hierarchical model ("B" trusts "B1") and Bridge model trusts ("B1" and "A1" trusts each other), so it's a Hybrid trust hierarchy model.
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