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Leopard Reference Library: 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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Keychain Services Programming Guide (HTML) (PDF)
This document explains how to use Keychain Services to store and retrieve passwords.
Guides 2009-03-12
Certificate, Key, and Trust Services Reference (HTML) (PDF)
Describes services to read and evaluate certificates and to use cryptographic keys.
Reference 2008-11-19
Code Signing Guide (HTML) (PDF)
Explains how you can sign your code and why you should.
Guides 2008-11-19
Keychain Services Reference (HTML) (PDF)
Describes the Keychain Services API, used to create, find, modify, and delete keychain items.
Reference 2008-11-19
Mac OS X Code Signing In Depth (HTML)
TN2206: Intermediate to expert level overview of code signing that details specific options and gotchas
Technical Notes 2008-08-06
Code Signing Release Notes (HTML)
Release Notes 2007-10-31
Cryptographic Message Syntax Services Reference (HTML) (PDF)
Describes the API for encrypting, signing, and decoding messages using Cryptographic Message Syntax (CMS).
Reference 2007-10-31
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.
Technical Q&As 2006-10-03
SecurityInterface Data Types Reference (HTML) (PDF)
Describes the data types found in the Security Interface framework.
Reference 2006-05-23
SFChooseIdentityPanel Class Reference (HTML) (PDF)
Describes the class that allows a user to select an identity from a list.
Reference 2006-05-23
Keychain Manager Reference (HTML) (PDF)
Describes the legacy C API for managing passwords for multiple users and databases. Replaced by Keychain Services.
Reference 2005-07-07
Apple Cryptographic Service Provider Functional Specification (PDF)
Specification for Apple's implementation of the Cryptographic Service Provider (CSP) CDSA plug-in.
Reference 2005-03-10
Secure Transport Reference (HTML) (PDF)
Describes the C API for creating a Secure Sockets Layer session over any transport layer.
Reference 2004-08-31
Creating Secure Transactions on Mac OS X Server with SSL (HTML)
Learn how to provide a layer of public-key encryption over any TCP connection.
Articles 2004-01-12