Switching on the new tools takes the number of categories to 23, and finally encrypts those backups, meaning that the data should be more secure. That also included iCloud backups of a device, which meant that theoretically everything on that same device could be accessed by Apple, hackers or law enforcement. Until now, however, a number of “data categories” were not encrypted, such as Photos and Notes. Apple already used end-to-end encryption on many kinds of data when they are stored in the cloud. Such end-to-end encryption means that only a user is able to access their files, and Apple does not have the key that would unlock them. They add new encryption to backups to ensure that they cannot be read by anyone else – including Apple. The new security updates are by far the most substantial change in the new software, however.
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