Apple Guide To Encryption Usage

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An Apple Support document (HT202303) provides a complete guide to how encryption is used by Apple products and services.

iCloud encrypts your data when it is sent over the Internet, storing it in an encrypted format when kept on server, and using secure tokens for authentication. iCloud uses a minimum of 128-bit AES encryption.

With a caveat for system version for Notes, it appears that everything Apple does - Calendars, Contacts, Bookmarks, Reminders, Photos, Documents in the Cloud, iCloud Drive, Backup, Find My iPhone, Find My Friends, iCloud Keychain - is encrypted both in transit and at rest. However iCloud does not encrypt data stored on IMAP mail servers.

iCloud Keychain uses 256-bit AES encryption to store and transmit passwords and credit card information. Also uses elliptic curve asymmetric cryptography and key wrapping.

Bruce Sewell, Apple’s Senior Vice President and General Counsel, has hinted that the next iteration of iCloud will include end-to-end encryption when he testified before a House committee.

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