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Leopard Technical Q&As: 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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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