After carefully
reading the terms of Apple's iCloud service on we found that Apple
hands still holding a super secret key, which means that under certain
conditions it is Apple's own power to deal with some non-compliant
content without going through consent of the user. And also mentioned
under the terms of the legal department asked the authorities to enforce
the situation, Apple has the right to access, use, or disclosure iCloud
content protection, which means that Apple can indeed understand the
contents of the user stored without the user's consent.
But this does not mean that Apple will randomly retrieved user data, iCloud backup data encryption mechanism has a sound. When users use iCloud backup, data is sent to the server has been encrypted, iCloud data using 128-bit AES encryption, while preserving the data will be stored in encrypted format on the server, and use the security token identification, so In case the user is not authorized anyone except Apple can not access the data stored in the cloud.
But this does not mean that Apple will randomly retrieved user data, iCloud backup data encryption mechanism has a sound. When users use iCloud backup, data is sent to the server has been encrypted, iCloud data using 128-bit AES encryption, while preserving the data will be stored in encrypted format on the server, and use the security token identification, so In case the user is not authorized anyone except Apple can not access the data stored in the cloud.