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# kSecAttrKeyType

A key whose value indicates the item’s algorithm.

```
let kSecAttrKeyType: CFString
```

## Discussion

The corresponding value is of type <doc://com.apple.documentation/documentation/CoreFoundation/CFNumber> and indicates the algorithm associated with this cryptographic key. See [Key Type Values](/documentation/Security/item-attribute-keys-and-values#Key-Type-Values) for a list of valid values.

---

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