# kSecClassKey The value that indicates a cryptographic key item. ``` let kSecClassKey: CFString ``` ## Discussion The following keychain item attributes form the composite primary key of a cryptographic key item: - [`kSecAttrAccessGroup`](/documentation/Security/kSecAttrAccessGroup) (on macOS, this key only applies if you set [`kSecUseDataProtectionKeychain`](/documentation/Security/kSecUseDataProtectionKeychain) or [`kSecAttrSynchronizable`](/documentation/Security/kSecAttrSynchronizable) to ) - [`kSecAttrApplicationLabel`](/documentation/Security/kSecAttrApplicationLabel) - [`kSecAttrApplicationTag`](/documentation/Security/kSecAttrApplicationTag) - [`kSecAttrEffectiveKeySize`](/documentation/Security/kSecAttrEffectiveKeySize) - [`kSecAttrKeyClass`](/documentation/Security/kSecAttrKeyClass) - [`kSecAttrKeySizeInBits`](/documentation/Security/kSecAttrKeySizeInBits) - [`kSecAttrKeyType`](/documentation/Security/kSecAttrKeyType) - [`kSecAttrSynchronizable`](/documentation/Security/kSecAttrSynchronizable) (on iOS 14 and newer, iOS 11 newer, and watchOS 7 and newer) Calls to [`SecItemAdd(_:_:)`](/documentation/Security/SecItemAdd(_:_:)) that add a cryptographic key item with the same values for all of these attributes as an existing item result in [`errSecDuplicateItem`](/documentation/Security/errSecDuplicateItem). The following keychain item attributes apply to a cryptographic key item, and don’t form part of its composite primary key: - [`kSecAttrAccess`](/documentation/Security/kSecAttrAccess) (macOS only) - [`kSecAttrAccessible`](/documentation/Security/kSecAttrAccessible) (on macOS, this key only applies if you set [`kSecUseDataProtectionKeychain`](/documentation/Security/kSecUseDataProtectionKeychain) or [`kSecAttrSynchronizable`](/documentation/Security/kSecAttrSynchronizable) to ) - [`kSecAttrLabel`](/documentation/Security/kSecAttrLabel) - [`kSecAttrIsPermanent`](/documentation/Security/kSecAttrIsPermanent) - [`kSecAttrPRF`](/documentation/Security/kSecAttrPRF) - [`kSecAttrSalt`](/documentation/Security/kSecAttrSalt) - [`kSecAttrRounds`](/documentation/Security/kSecAttrRounds) - [`kSecAttrCanEncrypt`](/documentation/Security/kSecAttrCanEncrypt) - [`kSecAttrCanDecrypt`](/documentation/Security/kSecAttrCanDecrypt) - [`kSecAttrCanDerive`](/documentation/Security/kSecAttrCanDerive) - [`kSecAttrCanSign`](/documentation/Security/kSecAttrCanSign) - [`kSecAttrCanVerify`](/documentation/Security/kSecAttrCanVerify) - [`kSecAttrCanWrap`](/documentation/Security/kSecAttrCanWrap) - [`kSecAttrCanUnwrap`](/documentation/Security/kSecAttrCanUnwrap) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)