Which method is a common verification in multifactor authentication?

In multifactor authentication (MFA), the goal is to enhance security by requiring two or more verification factors before granting access. The method of using a token in addition to a password exemplifies this approach effectively.

A token can come in various forms, such as a hardware device or a software application that generates a temporary code. When a user logs in, they first provide their password (something they know) and then must also input the token code (something they have). This dual-layer of verification significantly reduces the likelihood of unauthorized access because even if someone has the password, they would also need to have the token to complete the authentication process.

In contrast, relying solely on a password or solely on personal identification numbers does not meet the criteria for multifactor authentication, as these methods consist of only one factor of verification. Similarly, IP address verification alone does not involve multiple factors and is less secure since IP addresses can be spoofed or changed. Thus, using a token in conjunction with a password is a clear and effective method consistent with the principles of multifactor authentication.