Storing sensitive information in the Keychain

UserDefaults is an excellent storing mechanism, but it is unsuitable for storing data such as passwords or tokens. Keychain is Apple’s solution for storing sensitive data, and it provides a higher level of security and is an essential tool for iOS developers to protect their data.

Storing data in the keychain is much more complex than using other solutions. The keychain provides a particular API, based on the C function, to prevent malicious hackers from reverse-engineering calls to that API. The keychain also requires more information when saving, so it can save and index it more efficiently.

Let’s see how to store a simple token in the keychain while wrapping it with a class for convenience:

import UIKitimport Security
class KeychainManager {
    private let serviceName = "MyAppTokenService"
    func saveToken(token: String) -> Bool {
    ...