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You accomplish this by using the app to scan a QR Code (provided by the site on which you’re looking to protect an account).

Now that you’ve got Authy installed on your phone, you’ll want to set up your first 2FA accounts. Additional considerations to make your use of the Authy 2FA app even more secure

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Also, typically, the first time you download Authy, you’re not yet protecting any accounts with Authy 2FA, so security concerns over SMS at this step are low risk.

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The first time you install Authy, we need to verify you and ensure that you have access to the phone number you claim to own. The data needed to generate those codes remains on your physical device, not within the SIM card.Īt this point, you may be asking yourself “Doesn’t the Authy app use SMS as part of the app installation?” The answer is yes, and the reason is that we use your phone number as your identity, instead of something like a username and password. So even if an attacker tricked your cell service provider into completing a SIM swap, they still wouldn’t have access to your authentication codes. Apps like Authy or Google Authenticator generate something called a Time-based One-Time Passcode (TOTP) directly within the app.

This is a much more secure method for your 2FA login. If you have a smartphone or other mobile device, you can avoid using SMS and voice calls to get your 2FA code by downloading and installing one of many popular two-factor authentication apps directly to your device. Avoid security risks with a mobile 2FA app So yes, using SMS is not without risk, but it’s riskier to use nothing. But convincing multiple wireless providers to make changes to hundreds or thousands of customers phone plans takes a lot more effort and is much harder. From a cybercriminal’s perspective, downloading a massive list of usernames and passwords, and then automating account takeovers, is fairly simple. But hijacking SMS is not as easy as other forms of attack. While it is true that both these uses of the phone network are vulnerable to some form of attack, let’s remember one very important fact: two-factor authentication using SMS or voice is still far more secure than having no 2FA protection at all. And if a device is not SMS capable, two-factor authentication via a voice call covers almost everyone else. Since almost every online user has an SMS capable device these days, and practically the entire world is texting, there is no learning curve per se. The reason SMS for 2FA is so wildly popular is that it’s also incredibly easy to use. Any 2FA security is better than noneįirst things first, SMS is not going away. The concern that Decryptionary has is if the Authy app uses SMS during the install process, isn’t Authy also vulnerable? This is another excellent question and one that we’ll be clarifying in this blog post.

As such, the security industry and various media have been advising that users avoid using SMS for 2FA, and instead use apps on your phone (like our Authy app ) which generate the same security code without the need for it to be sent via SMS.

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Typically, this is done when an attacker already has your username and password and also needs to get the two-factor authentication (2FA) text message as part of an account takeover. Phone porting is where cybercriminals trick your phone company into swapping your phone number to a different device and SIM card. For those who aren’t familiar, a SIM card is a small, removable chip inside a mobile phone, carrying an identification number unique to the owner, and storing personal data. There has been an increase in phone porting attacks (sometimes known as SIM swapping ). Authy was recently contacted by Decryptionary, a cryptocurrency and blockchain dictionary, with concerns about security vulnerabilities of using SMS for two-factor authentication (2FA) and questions about how SMS is used in conjunction with the Authy 2FA apps.