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Leopard Guides: Security
Cryptography is the use of encryption and decryption to protect data from unauthorized use. Several Mac OS X services and interfaces make use of encryption. Developers can use these services to store encryption keys and to safely store sensitive data or transmit it over a network.

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Code Signing Guide (HTML) (PDF)
Explains how you can sign your code and why you should.
2008-11-19
Keychain Services Programming Guide (HTML) (PDF)
This document explains how to use Keychain Services to store and retrieve passwords.
2009-03-12