So much of your digital life now lives in the cloud. And we’re committed to making that experience secure and simple to use. Unlike our competitors, we never scan any of your iCloud data for advertising. All your iCloud content is encrypted in transit and, in most cases, when stored (see below). If we use third-party vendors to store your data, we encrypt it and never give them the keys. Apple retains the encryption keys in our own data centers, so you can back up, sync, and share your iCloud data.
One of the best ways to protect not only your iCloud account, but every online account you use, is to choose a strong, unique password. iCloud Keychain helps you do just that. In conjunction with Safari, it suggests strong, unique passwords for the websites you use. It stores them securely in a way that Apple cannot access and keeps them up to date on your devices. And it fills them in for you automatically when you log in to a website. In addition to a strong password, enabling two‑step verification gives you another layer of protection for your iCloud account and the information you keep there.
Learn more about iCloud security