In fact, biometrics can be realized by using the uniqueness of biological characteristics, that is, everyone's biological characteristics are unique. And this uniqueness determines the immutability of biological characteristics. For example, if the digital password of the mobile phone is leaked, the user can modify the password to ensure security; If the face information is leaked, it cannot be modified. This means that once the biometric is revealed, the risk may be permanent.
It is also biometric, but the lip unlocking is "modifiable". As can be seen from the description, this is actually a combination of biology and password. Because the unlocking process requires people to read a string of characters or numbers, the actual unlocking includes two parts, one is the characteristics of people's lips, and the other is the read content. The former is biometric and the latter is password, so the unlocking method can be modified.
Specifically, in the unlocking mode of combining biology and password, the unlocking principle can be divided into two types-lip feature priority and password feature priority. For example, the preset storage lip feature is "People read111with or without voice". In the lip feature priority mode, the current and previously stored lip features will be saved. If the matching degree is between 50% and 80%, verify whether the password is correct, that is, whether the four numbers "111"have been read. If it is correct, the unlocking is successful; If there is an error, the unlocking fails.
Although the patent of lip unlocking disclosed by Huawei does solve the inherent "unmodifiable" problem of biometrics, its convenience is obviously not as good as that of face recognition. After all, in order to unlock it, users need to hold up their mobile phones and say a series of words to the camera, which may be awkward whether reading aloud or lip-synching.
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