monitekijätunnistautuminen

Monitekijätunnistautuminen, often abbreviated as MFA or 2FA, is a security process that requires users to provide two or more verification factors to gain access to a resource, such as an online account. This method is designed to add an extra layer of security beyond just a username and password, which can be vulnerable to theft or compromise.

The verification factors are typically categorized into three types: something the user knows (like a password or PIN), something the user has (like a smartphone, security token, or smart card), and something the user is (like a fingerprint or facial scan, known as biometrics). MFA requires a combination of at least two of these categories. For example, a common MFA setup involves a user entering their password (something they know) and then a one-time code sent to their registered mobile device (something they have).

Implementing MFA significantly enhances security by making it much harder for unauthorized individuals to access accounts, even if they manage to obtain the user's primary password. It is widely recommended for protecting sensitive information and preventing account takeovers. Many online services, including email providers, financial institutions, and social media platforms, offer MFA as an option for their users.