![]() But because of this, contrary to virtual devices, there is no way to backup it. These devices are tamper-proof to some extent but also tamper-evident, meaning it’s hard to extract the secret but you’ll also notice that someone tried to do it. All you need to do is to type the serial number and two codes, and the device is associated with your account. This is manufactured with the secret included so there is no need to transfer it to the device. To make sure a TOTP secret can not be copied you can buy dedicated hardware. If an attacker has access to your phone he can extract the codes and later use them to sign in to your account. ![]() This has advantages, such as the ability to backup the codes to another device or the cloud, but comes with a slight compromise on the security. Note that technically it is still something you know, the shared secret, and it can be recovered from your phone. Google Authenticator is probably the best-known, but there is Authy, LastPass Authenticator, andOTP, and even web-based ones, such as totp.app. The second factor is your phone in this case. After synchronizing the secret to the app it generates the digits you can use to log in. The easiest way to start using MFA is to use a virtual token, which is usually an app that runs on your phone. The QR code is just a convenient way to transfer this to the phone as many apps allow reading these codes.Īuthentication works by using this secret and the clock: It is more apparent when adding a virtual device: When you add an MFA device to an AWS account, you need to get the secret key to both sides. Since both of these data are present on both sides the server can verify the digits. The digits you see on the device are the hash of the shared secret and the current value of the clock rounded to 30 seconds. It works by having a secret key shared between the device and the server, and a synchronized clock. When you log in, you need to input the numbers you see in addition to the password. TOTP is short for Time-based One-time Password, which is a device or an app that shows a 6-digit number every 30 seconds. They are fundamentally different, so let’s see each of them! TOTP-based MFA When there is one associated with the user, signing in to the Console requires using it. In AWS, each IAM user and the root user can have an MFA device. ![]()
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