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Leopard Technical Q&As: Cocoa
Mac OS X provides a number of authorization, authentication, and cryptographic services that developers can use to build security into their applications. These interfaces include an Objective-C API that provides authorization services and user interfaces for managing authorization, certificates, and keychains, plus several C APIs that can be called from Cocoa applications to provide lower-level security and secure networking services.

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Security Framework Error Codes (HTML)
QA1499: Explains how to interpret errors returned by the Security Framework with an overview of Security error handling.
2006-11-16
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
CFBundleIdentifier and user application access (HTML)
QA1373: Describes the role of CFBundleIdentifier in limiting a user's application access.
2005-02-08