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The basic concepts are
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Principal Interface; this describes real-world entities like persons, companies etc.
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Identity class; an identity is derived from Principal Interface and has property corresponding to a public key
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Certificate class; a certificate has two properties of class Identity: one is the Identity that is being certified, and the other Identity is a guarantor, with which the principal is associated for this certificate.
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To keep identities safe from conflicts, e.g., " G. Fox" at NPAC and "G. Fox" at Sun Inc. , Java defines IdentityScopes.
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An IdentityScope may have other IdentityScopes in it. For example, Syracuse University is an IdentityScope, and it contains the NPAC IdentityScope.
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