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Two-factor authentication (also known as 2FA or 2-Step Verification) is a technology patented in 1984 that provides identification of users by means of the combination of two different components. These components may be something that the user knows, something that the user possesses or something that is inseparable from the user. A good example from everyday life is the withdrawing of money from a cash machine. Only the correct combination of a bank card (something that the user possesses) and a PIN (personal identification number, i.e. something that the user knows) allows the transaction to be carried out. 2FA is ineffective against modern threats, like ATM skimming, phishing, and malware etc. Two-factor authentication is a type of multi-factor authentication. == Components == The use of two-factor authentication to prove one's identity is based on the premise that an unauthorized actor is unlikely to be able to supply both factors required for access. If in an authentication attempt at least one of the components is missing or supplied incorrectly, the user's identity is not established with sufficient certainty and access to the asset (e.g., a building, or data) being protected by two-factor authentication then remains blocked. The authentication factors of a two-factor authentication scheme may include: * some physical object in the possession of the user, such as a USB stick with a secret token, a bank card, a key, etc. * some secret known to the user, such as a username, password, PIN, TAN, etc. * some physical characteristic of the user (biometrics), such as a fingerprint, eye iris, voice, typing speed, pattern in key press intervals, etc.〔(【引用サイトリンク】url=http://www.virtualdcs.co.uk/blog/should-two-factor-authentication-be-the-norm.html )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Two-factor authentication」の詳細全文を読む スポンサード リンク
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