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Leopard Articles
Mac OS X provides a number of system-level authorization, authentication, and cryptographic services that software and hardware developers can use to build security into their products. In addition, Mac OS X provides programming interfaces to SSL/TLS that developers can use to transport data securely over a network.

A guided introduction for developers implementing security features in Mac OS X.   Essential information for developers building security into their products.   API references organized by framework.
Security Topics
View the complete Security Articles List.
Services that aid in verifying the identity of a user or service.   APIs for the use of ciphers, encryption keys, and encryption algorithms.   Resources for creating hardware devices compatible with Apple security technology.

Authentication, authorization, and cryptographic services of interest to web developers.   Authentication, authorization, and cryptographic services for server applications.