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Leopard Technical Q&As: Security
Authentication is the process of determining and verifying the identity of a user or service. Developers can use the Mac OS X authentication services and programming interfaces to authenticate users and to store certificates that can be used for authentication. Note that although Authorization Services also performs authentication, it does not return the identity of the authenticated entity to the caller.
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AuthorizationCreateFromExternalForm 100022 Error Explained (HTML)
QA1498: Explains the undocumented 100022 return value from AuthorizationCreateFromExternalForm.
 2007-01-04
Describing the kSecTrustResultUnspecified error. (HTML)
QA1360: Explaining the semantics behind the kSecTrustResultUnspecified error returned by the Security APIs.
 2007-02-05
Programmatically Accessing and Manipulating Multiple Keychain Items (HTML)
QA1486: An explanation on what is and is not possible using the SecKeychain API to manipulate Keychain Items.
 2006-10-03