Our server repeats the process and if the code matches, you're in! Strengths and weaknesses When prompted, you type the code into the input box: To make it easier to type, the access code is shortened to a 6-digit number. In layman's terms, it mixes the time and your key together to produce an output that's unique (if the time or the key are different in even the slightest way then the output is completely different), but impossible to reverse (knowing the output doesn't help you guess the secret key). It does this using something called a "secure hash function" (for the crypto-heads out there, it uses HMAC-SHA-1, just so you know). To do this, your app combines the key with the current time (to the nearest 30 seconds) to produce an access code. When you want to log in, you need to prove that you have the key. Now your phone and our server both have a copy of this secret key. (If your phone doesn't have a camera, you can manually type in the long code instead.) You then save this key to your phone, normally by scanning a QR code (2D bar code) with your authenticator app. When you set up TOTP, our server generates a secret key - a bunch of random numbers and letters. Some of the most popular ones are Google Authenticator, Authy, Duo and 1Password. Because it's a standard, you can get many different (and mostly free) authenticator apps for your mobile phone that support it. It is a standardised method for generating a regularly changing code based on a shared secret (that is to say, shared by our server and your phone no one else!). TOTP stands for Time-Based One-Time Password. Stay tuned for further posts explaining U2F and Yubico OTP! How TOTP (authenticator apps) work In this post, we'll try to give an accessible explanation for how TOTP works under the hood, plus briefly explore its strengths and weaknesses. Once you have one of these set up, you can also get a one-time code via SMS to any of your recovery phones to complete two-step verification. Yubico OTP (a proprietary one-time password scheme from Yubico).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |