Apple released a new version of its iOS security guide from January 2018. The new document, which is set out on 78 pages, contains information about the safe operation of the money transfer service Apple Pay Cash, Face ID and not only.
Apple releases new versions of its iOS security guide several times a year. The main purpose of this document is a thorough analysis of the security parameters implemented in the latest versions of iOS.
As for Face ID, Apple's updated security document describes most of what we already know. The company recalls that the function is not designed to completely replace the password, but rather emphasizes the need for longer and more reliable passwords. Apple writes that Face ID is designed to provide easy access to your device.
Using Face ID, using a longer and more complex password becomes much more practical, because you do not need to enter it so often.
Apple also describes with what probability someone can unlock your iPhone using Face ID, including twins and other relatives.
The probability that an occasional person will be able to look at your iPhone X and unlock it using the face identifier is approximately 1 to 1 million (versus 1 to 50,000 for the Touch ID). For added security, both the Touch ID and Face ID identifiers allow only five unsuccessful typing attempts before you need to enter a password.
With the face identifier, the likelihood of a false coincidence is different for twins and siblings like you, as well as for children under the age of 13, because their distinctive features may not be fully developed.
The document also describes the security of the new Apple Pay Cash feature, which became available to US users of iOS 11.2. Apple's security department states that the company will store and use transaction data to protect against fraud and other purposes in some cases:
Apple Payments Inc. will store and can use your transaction data to troubleshoot, prevent fraud and other purposes. All the rest in Apple can not find out to whom you sent money, from whom you received money or how much you made a purchase with your Apple Pay Cash card.
The complete iOS security guide in English can be viewed at