When it was released earlier, Apple emphasized that Touch ID does not store any fingerprint images of users, but only digital characters representing fingerprints. The fingerprint data input by the user is stored in the safe enclave of the processor, and others will not know it, even Apple itself cannot obtain it. However, the touch ID is a bit "silly" when inputting user fingerprint data. Why do you say that?
Specific process:
When you enter the fingerprint data of a finger, record it once, and then the system will let you try it many times. At this time, use other fingers to input (theoretically, there can be more than one). Eventually you will find that all the input fingers can be unlocked!
For example, input with thumb first, then input with index finger, middle finger, ring finger and little finger in turn. When finished, all five fingers can be unlocked. In addition, only one fingerprint input opportunity is used. Isn't it amazing?
In fact, this also proves that when Apple enters fingerprint data, it only enters a part of the data at a time, and after several times of superposition, it obtains complete data. But the wonderful thing is that even if several different finger fingerprint data are superimposed, they can still be successfully entered.
Perhaps, Apple also has its reasons for adopting this mechanism, such as considering the success rate of fingerprint unlocking and so on. However, such a mechanism does have loopholes and security risks.