Strong authentication refers to any method of verifying the identity of a user or device that is considered tough enough to defend the system it is set up to protect. While strong authentication usually consists of two or more factors, sometimes even single-factor authentication is considered strong.
See also: access control entry, authentication server, two-factor authentication, one-time password
Usually, strong authentication relies on authenticating multiple factors such as something the user knows (a password), something the user has (a physical token or smart card), or something the user is (biometric data). This way it is able to provide a higher level of security than traditional authentication consisting of a username and password.
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