![]() The user taps the Lock Now button in Notes The user still needs to authenticate for notes protected by a different passphrase. However, the secure session applies only to notes protected with the provided passphrase. While the secure session is open, the user can view or secure other notes without additional authentication. After successfully authenticating the user, whether to view or create a secure note, Notes opens a secure session. To view a secure note, the user must enter their passphrase or authenticate using Face ID or Touch ID. Notes containing other types of attachments can’t be encrypted, and unsupported attachments can’t be added to secure notes. Attachments that support encryption include images, sketches, tables, maps, and websites. After the new records are created, the original unencrypted data is deleted. New records are created in Core Data and CloudKit to store the encrypted note, attachments, tag, and initialization vector. The note and all of its attachments are encrypted using AES with Galois/Counter Mode (AES-GCM). When a user secures a note, a 16-byte key is derived from the user’s passphrase using PBKDF2 and SHA256. Each iCloud account (including “On my” device accounts) can have a separate passphrase. Secure notes are end-to-end encrypted using a user-provided passphrase that is required to view the notes on iOS, iPadOS, macOS devices, and the iCloud website.
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