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Google Authenticator is a software-based authenticator by Google. It implements multi-factor authentication services using the time-based one-time password (TOTP; specified in RFC 6238) and HMAC-based one-time password (HOTP; specified in RFC 4226), for authenticating users of software applications.
Click the + button at the top-left of Authenticator. Add the secret 2FA key to Authenticator using either one of these methods: Use Authenticator to take a screenshot of the QR code: Click the QR code button at the top-right of Authenticator. Position your pointer before the top-left corner of the QR code from "Step 2" of the 2FA setup page.
privacyIDEA Authenticator [22] For use with privacyIDEA Authentication Server, with a secure enrollment process. No No No No Yes Yes No No Yes Yes Yes No Unknown andOTP [23] (unmaintained) [24] Open-source app for Android 4.4+. Compatible with Google Authenticator. No No No No No Yes No No No No Yes No No Invantive Authenticator [25]
4. Select Authenticator app for your 2-step verification method.-To see this option, you'll need to have at least 2 recovery methods on your account . 5. Click Continue. 6. Scan the QR code using your authenticator app. 7. Click Continue. 8. Enter the code shown in your authenticator app. 9. Click Done. Sign in with 2-step for authenticator app. 1.
A secret key K, which is an arbitrary byte string and must remain private; A counter C, which counts the number of iterations; A HOTP value length d (6–10, default is 6, and 6–8 is recommended) Both parties compute the HOTP value derived from the secret key K and the counter C. Then the authenticator checks its locally generated value ...
Since an attacker could use this secret to impersonate the user, an authenticator secret must be protected from theft or loss. The type of secret is an important characteristic of the authenticator. There are three basic types of authenticator secret: a memorized secret and two types of cryptographic keys, either a symmetric key or a private key.
Using public key cryptography, it is possible to prove possession of a private key without revealing that key. The authentication server encrypts a challenge (typically a random number, or at least data with some random parts) with a public key; the device proves it possesses a copy of the matching private key by providing the decrypted challenge.
There are two primary architectures for software tokens: shared secret and public-key cryptography. For a shared secret, an administrator will typically generate a configuration file for each end-user. The file will contain a username, a personal identification number, and the secret. This configuration file is given to the user. The shared ...