To start using Touch ID, you must first set up a passcode on your iPhone or iPad (or a password on your Mac). Although some codes, like “1234,” might be more easily guessed, there is no such thing as an easily guessable fingerprint pattern. By comparison, the odds of guessing a typical 4-digit passcode are 1 in 10,000. And Touch ID allows only five unsuccessful fingerprint match attempts before you must enter your password. The probability of this happening is 1 in 50,000 with a single, enrolled finger. Security safeguardsĮvery fingerprint is unique, so it’s rare that even a small section of two separate fingerprints are alike enough to register as a match for Touch ID. Touch ID will incrementally update the mathematical representation of enrolled fingerprints over time to improve matching accuracy. It’s only this mathematical representation of your fingerprint that is stored-never images of your finger itself. It then creates a mathematical representation of your fingerprint and compares this to your enrolled fingerprint data to identify a match and unlock your device. Touch ID can read multiple fingerprints, and it can read fingerprints in 360-degrees of orientation. It also maps out individual details in the ridges that are smaller than the human eye can see, and even inspects minor variations in ridge direction caused by pores and edge structures. It categorizes your fingerprint as one of three basic types-arch, loop, or whorl. Touch ID then intelligently analyzes this information with a remarkable degree of detail and precision. The sensor uses advanced capacitive touch to take a high-resolution image from small sections of your fingerprint from the subepidermal layers of your skin. On iPhone and iPad, a steel ring surrounding the button detects your finger and tells Touch ID to start reading your fingerprint. This protects the sensor and acts as a lens to precisely focus it on your finger. The button is made from sapphire crystal-one of the clearest, hardest materials available. The technology within Touch ID is some of the most advanced hardware and software that we've put into any device. Developers can also allow you to use Touch ID to sign into their apps. You can use it to authorize purchases from the iTunes Store, App Store, and Apple Books, as well as with Apple Pay. With just a touch of your finger, the sensor quickly reads your fingerprint and automatically unlocks your device. Using Touch ID on your iPhone, iPad, and Mac is an easy way to use your fingerprint instead of a password for many common operations. Much of our digital lives is stored on our Apple devices, and we recommend that you always use a passcode or password to help protect this important information and your privacy. Learn how Touch ID helps protect information on your iPhone, iPad, and Mac. There's no reason to, and in fact you shouldn't.About Touch ID advanced security technology If this is an inconvenience, then what you should do is simply stop shutting down your Mac. But when you log in with your password, it unlocks the Secure Enclave and now you can use Touch ID. You can't use Touch ID yet, because there is nothing to match your fingerprint to. So when you first log in, the Secure Enclave is locked. This includes the fingerprint data used by Touch ID. That is where some high security data resides on your Mac. The technical reason is the Secure Enclave. You always have to enter your password the first time you access the account. There is no "no password, only Touch ID" level. The highest level requires a password to get access to your Mac user account. "To use Touch ID for these tasks, you must have logged in to your Mac already by entering your password." You can't use Touch ID to log in for the first time. Any time you log out of your account you need to log back in again with a password. When you shut down a Mac you are logging out of your account.
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