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In general, using SMS and automated phone calls to receive a one-time token is less secure than relying on a software token app like Google Authenticator or Authy. 2fa.directory maintains probably the most comprehensive list of which sites support 2FA, indexing each by type of site (email, gaming, finance, etc) and the type of 2FA offered (SMS, phone call, software token, etc.). Hundreds of sites now support multi-factor authentication. If a site you frequent does not yet support WebAuthn, please consider hardening your login with another form of 2FA. Yubikey also sells more expensive U2F keys designed to work with mobile devices.
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Probably the most popular maker of Security Keys is Yubico, which sells a basic U2F key for $20 (it offers regular USB versions as well as those made for devices that require USB-C connections, such as Apple’s newer Mac OS systems). According to a recent article at, Apple has not yet said when or if it will support the standard in its Safari browser. Microsoft says it expects to roll out updates to its flagship Edge browser to support U2F later this year. To turn it on, type “about:config” in the browser bar, type or paste “2f” and double-click the resulting entry to change the preference’s value from “false” to “true.” In both Firefox and Quantum (the newer, faster version of Firefox), U2F is not enabled by default. The beauty of WebAuthn is that it eliminates the need for users to constantly type in their passwords, which negates the threat from common password-stealing methods like phishing and man-in-the-middle attacks.Ĭurrently, U2F is supported by Chrome, Mozilla Firefox, and Opera. With any luck, more sites soon will begin incorporating the Web Authentication API - also known as “ WebAuthn” - a standard put forth by the World Wide Web Consortium in collaboration with the FIDO Alliance. Duo Security also can be set up to work with U2F.
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Most major password managers also now support U2F, including Dashlane, and Keepass. U2F is an emerging open source authentication standard, and as such only a handful of high-profile sites currently support it, including Dropbox, Facebook, Github (and of course Google’s various services). Once a device is enrolled for a specific Web site that supports Security Keys, the user no longer needs to enter their password at that site (unless they try to access the same account from a different device, in which case it will ask the user to insert their key). The key works without the need for any special software drivers. In contrast, a Security Key implements a form of multi-factor authentication known as Universal 2nd Factor (U2F), which allows the user to complete the login process simply by inserting the USB device and pressing a button on the device. Indeed, prior to 2017 Google employees also relied on one-time codes generated by a mobile app - Google Authenticator.
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The most common forms of 2FA require the user to supplement a password with a one-time code sent to their mobile device via text message or an app. The basic idea behind two-factor authentication is that even if thieves manage to phish or steal your password, they still cannot log in to your account unless they also hack or possess that second factor. It all depends on the sensitivity of the app and the risk of the user at that point in time.” “Users might be asked to authenticate using their security key for many different apps/reasons.
“We have had no reported or confirmed account takeovers since implementing security keys at Google,” the spokesperson said. Security Keys are inexpensive USB-based devices that offer an alternative approach to two-factor authentication (2FA), which requires the user to log in to a Web site using something they know (the password) and something they have (e.g., a mobile device).Ī Google spokesperson said Security Keys now form the basis of all account access at Google. The basic model featured here retails for $20.