What is two-factor authentication? Two-factor authentication, or 2FA, is a type of multi-factor authentication and adds an extra layer of security to online accounts. Secure your website with Wordfence Login Security, providing two-factor authentication, login and registration CAPTCHA, and Wordfence + aktive. Many translated example sentences containing "two-factor authentication" – German-English dictionary and search engine for German translations.
2-Factor-Authentication (2FA) in EGroupwareWas ist eine Zwei-Faktor-Authentifizierung (2-Factor Authentication (2FA))?. Die Zwei-Faktor-Authentifizierung (2FA) ist eine Kombination aus zwei. Google Authenticator generates 2-Step Verification codes on your phone. 2-Step Verification provides stronger security for your Google Account by requiring a. Die Multi-Faktor-Authentifizierung, auch Multifaktor-Authentisierung, ist eine Verallgemeinerung der Zwei-Faktor-Authentisierung, bei der die Zugangsberechtigung durch mehrere unabhängige Merkmale überprüft wird.
2 Step Authentication Navigation menu VideoExplaining Two-Factor Authentication 12/4/ · Two-step verification is a process that involves two authentication methods performed one after the other to verify that someone or something requesting access is who or what they are declared to be. The difference between two-step verification and two-factor authentication.
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Typically an X. These are factors associated with the user, and are usually biometric methods, including fingerprint , face , voice , or iris recognition.
Behavioral biometrics such as keystroke dynamics can also be used. Increasingly, a fourth factor is coming into play involving the physical location of the user.
While hard wired to the corporate network, a user could be allowed to login using only a pin code while off the network entering a code from a soft token as well could be required.
This could be seen as an acceptable standard where access into the office is controlled. Systems for network admission control work in similar ways where your level of network access can be contingent on the specific network your device is connected to, such as wifi vs wired connectivity.
This also allows a user to move between offices and dynamically receive the same level of network access in each. Many multi-factor authentication vendors offer mobile phone-based authentication.
Some methods include push-based authentication, QR code based authentication, one-time password authentication event-based and time-based , and SMS-based verification.
SMS-based verification suffers from some security concerns. Phones can be cloned, apps can run on several phones and cell-phone maintenance personnel can read SMS texts.
Not least, cell phones can be compromised in general, meaning the phone is no longer something only the user has.
The major drawback of authentication including something the user possesses is that the user must carry around the physical token the USB stick, the bank card, the key or similar , practically at all times.
Loss and theft are risks. Many organizations forbid carrying USB and electronic devices in or out of premises owing to malware and data theft-risks, and most important machines do not have USB ports for the same reason.
Physical tokens usually do not scale, typically requiring a new token for each new account and system. Procuring and subsequently replacing tokens of this kind involves costs.
In addition, there are inherent conflicts and unavoidable trade-offs between usability and security.
Two-step authentication involving mobile phones and smartphones provides an alternative to dedicated physical devices.
To authenticate, people can use their personal access codes to the device i. The passcode can be sent to their mobile device  by SMS or can be generated by a one-time passcode-generator app.
In both cases, the advantage of using a mobile phone is that there is no need for an additional dedicated token, as users tend to carry their mobile devices around at all times.
As of [update] , SMS is the most broadly-adopted multi-factor authentication method for consumer-facing accounts. In and respectively, both Google and Apple started offering user two-step authentication with push notification [ clarification needed ] as an alternative method.
Security of mobile-delivered security tokens fully depends on the mobile operator's operational security and can be easily breached by wiretapping or SIM cloning by national security agencies.
Advances in research of two-factor authentication for mobile devices consider different methods in which a second factor can be implemented while not posing a hindrance to the user.
For example, by recording the ambient noise of the user's location from a mobile device and comparing it with the recording of the ambient noise from the computer in the same room in which the user is trying to authenticate, one is able to have an effective second factor of authentication.
The second Payment Services Directive requires " strong customer authentication " on most electronic payments in the European Economic Area since September 14, In India, the Reserve Bank of India mandated two-factor authentication for all online transactions made using a debit or credit card using either a password or a one-time password sent over SMS.
Vendors such as Uber have been pulled up by the central bank for allowing transactions to take place without two-factor authentication.
Existing authentication methodologies involve the explained three types of basic "factors". Authentication methods that depend on more than one factor are more difficult to compromise than single-factor methods.
IT regulatory standards for access to Federal Government systems require the use of multi-factor authentication to access sensitive IT resources, for example when logging on to network devices to perform administrative tasks  and when accessing any computer using a privileged login.
NIST Special Publication discusses various forms of two-factor authentication and provides guidance on using them in business processes requiring different levels of assurance.
In , the United States ' Federal Financial Institutions Examination Council issued guidance for financial institutions recommending financial institutions conduct risk-based assessments, evaluate customer awareness programs, and develop security measures to reliably authenticate customers remotely accessing online financial services , officially recommending the use of authentication methods that depend on more than one factor specifically, what a user knows, has, and is to determine the user's identity.
Due to the resulting confusion and widespread adoption of such methods, on August 15, , the FFIEC published supplemental guidelines—which states that by definition, a "true" multi-factor authentication system must use distinct instances of the three factors of authentication it had defined, and not just use multiple instances of a single factor.
According to proponents, multi-factor authentication could drastically reduce the incidence of online identity theft and other online fraud , because the victim's password would no longer be enough to give a thief permanent access to their information.
However, many multi-factor authentication approaches remain vulnerable to phishing ,  man-in-the-browser , and man-in-the-middle attacks. Multi-factor authentication may be ineffective  against modern threats, like ATM skimming, phishing, and malware.
The criminals first infected the account holder's computers in an attempt to steal their bank account credentials and phone numbers.
Then the attackers purchased access to a fake telecom provider and set-up a redirect for the victim's phone number to a handset controlled by them.
Finally the attackers logged into victims' online bank accounts and requested for the money on the accounts to be withdrawn to accounts owned by the criminals.
SMS passcodes were routed to phone numbers controlled by the attackers and the criminals transferred the money out. Many multi-factor authentication products require users to deploy client software to make multi-factor authentication systems work.
Some vendors have created separate installation packages for network login, Web access credentials and VPN connection credentials.
For such products, there may be four or five different software packages to push down to the client PC in order to make use of the token or smart card.
This translates to four or five packages on which version control has to be performed, and four or five packages to check for conflicts with business applications.
If access can be operated using web pages , it is possible to limit the overheads outlined above to a single application.
With other multi-factor authentication solutions, such as "virtual" tokens and some hardware token products, no software must be installed by end users.
There are drawbacks to multi-factor authentication that are keeping many approaches from becoming widespread.
Some users have difficulty keeping track of a hardware token or USB plug. Many users do not have the technical skills needed to install a client-side software certificate by themselves.
Generally, multi-factor solutions require additional investment for implementation and costs for maintenance. Most hardware token-based systems are proprietary and some vendors charge an annual fee per user.
Even if someone else finds your password, they'll be stopped if they don't have access to your security info. This is also why it's important to use different passwords for all your accounts.
This means that if you forget your password, you need two contact methods. Or if you lose your contact method, your password alone won't get you back into your account—and it can take you 30 days to regain access.
You may even lose access to the account. When two-step verification is turned off, you will only have to verify your identity with security codes periodically, when there might be a risk to your account security.
Two-step verification begins with an email address we recommend two different email addresses, the one you normally use, and one as a backup just in case , a phone number, or an authenticator app.
When you sign in on a new device or from a new location, we'll send you a security code to enter on the sign-in page. For more info about the authenticator app, see How to use the Microsoft Authenticator app.
Go to the Security basics page and sign in with your Microsoft account. See features. Home Features Help. Why you need it How it works How it protects you.
Why you need it It's easier than you think for someone to steal your password. It's easier than you think for someone to steal your password Any of these common actions could put you at risk of having your password stolen: Using the same password on more than one site Downloading software from the Internet Clicking on links in email messages 2-Step Verification can help keep bad guys out, even if they have your password.
Imagine losing access to your account and everything in it When a bad guy steals your password, they could lock you out of your account, and then do some of the following: Go through — or even delete — all of your emails, contacts, photos, etc.
Pretend to be you and send unwanted or harmful emails to your contacts Use your account to reset the passwords for your other accounts banking, shopping, etc.
Join millions of others who have made their accounts stronger with 2-Step Verification Get Started See how it works.
Signing in to your account will work a little differently. Signing in to your account will work a little differently 1 You'll enter your password Whenever you sign in to Google, you'll enter your password as usual.
Keep sign-in simple During sign-in, you can choose not to use 2-Step Verification again on that particular computer.