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Establish trust using certificates and cryptographic keys.
Overview
The certificate, key, and trust services API is a collection of functions and data structures that you use to conduct secure and authenticated data transactions. Specifically, you use this API to manage and use:
- Certificates and identities. A certificate is a collection of data that identifies its owner in a tamper-evident way. When you use a certificate to distribute a public key, a receiver can be confident of its origin. You can also package a certificate together with its corresponding private key in an identity object that you keep secret.
- Policies and trust services. When you receive a certificate, before you can use the embedded public key, you have to answer the question, “Can I trust this certificate?” You conduct an evaluation of trust according to a set of criteria, or a trust policy.
- Cryptographic keys. After you have a key whose origin you trust, you can begin to conduct cryptographic operations, such as encryption or data signing and verification. These operations in turn typically serve a larger purpose, such as authenticating a user, transmitting data securely, or verifying that a block of data is unaltered since being sealed with a signature.
Note
Rely on the classes of the SecurityInterface framework to ensure a consistent experience when displaying certificates and trust settings to the user and when the user chooses among identities or modifies keychain settings.
Topics
Certificates
Keys
IdentitiesCombine certificates and cryptographic keys into identities.
Policies
Trust
Working with ConcurrencyLearn about thread safety issues related to the certificate, key, and trust services API.
See Also
Complying with Encryption Export Regulations![Key Key](/uploads/1/2/4/8/124813068/579660210.jpg)
Declare the use of encryption in your app to streamline the app submission process.
Cryptographic Message Syntax ServicesCryptographically sign and encrypt S/MIME messages.
Randomization Services
Security TransformsPerform cryptographic functions like encoding, encryption, signing, and signature verification.
ASN.1Encode and decode Distinguished Encoding Rules (DER) and Basic Encoding Rules (BER) data streams.
SecurityInterfaceProvide user interface elements for security features such as authorization, access to digital certificates, and access to items in keychains.