How to authenticate users without background and dynamic voice?

If there is no background or dynamic voice function, users can still be authenticated in other ways. Here are some possible alternatives: 1. User name and password: Require users to create an account and set a user name and password for login verification. 2. Mailbox verification: When users register, they need to provide a valid email address and send a verification link to the mailbox. Users need to click on the link to confirm and verify their identity. 3. Mobile phone number verification: The user is required to provide a valid mobile phone number and verify it by SMS verification code. The user will receive a short message containing the verification code, and need to enter the verification code for verification. 4. Graphic verification code: When users perform sensitive operations (such as registration, login and password reset), they need to enter a graphic verification code. This can prevent automated scripts or robot attacks. 5. Two-factor authentication: Combine multiple authentication factors, such as password, mobile phone verification code, fingerprint identification, etc. To increase the security of user authentication.