9/26/2023 0 Comments My gmail backup codes![]() Google Authenticator and other 2fa providers use a hash generated by SHA-1 to generate the 2fa codes which is the standard for HOTP (RFC4226) and TOTP (RFC6238). But in general, either the plaintext or the key need to be uniform. When using One-Time Pads (OTP) to encrypt a sentence, the key must be uniform to guard against frequency analysis. Therefore, you should use a different key for each account which negates one of the major benefits of this method: that you only have to memorize one key. Your 2fa backup code security is then only as good as the weakest account provider. While it is standard practice for account providers to rate-limit logins to help prevent brute-force attacks, some account providers may have worse protection than others and it should not be assumed that all account providers have adequate protection. One weakness of this is if you use the same key to use a One-Time Pad to encrypt all your 2fa backup codes and one of your codes gets brute-forced, the attacker can derive the key and then decrypt all your codes. Since the 2fa code's characters are nearly-uniform (all characters are equally likely to appear in each key position), you can use a non-uniform key such as an easy-to-remember phrase.Ī bonus to encrypting your codes is you can carry multiple copies of them (one in your suitcase, one in your wallet, one on a public URL) and not worry about them getting lost or stolen. Then you can easily decrypt them with a pen and paper as long as you remember the key. You may need to log in.Use the One-Time Pad method to encrypt the codes. Head to the Security tab of your account page.If you think someone else might have access to your backup codes, you can generate new ones. If you’re using a shared computer, don’t download your backup codes.Save your backup codes in a secure place.We show you your backup codes when you turn on 2-step verification, and you can also find them on your account page under password protection. If you lose your phone or can't access your authenticator app, you can use a backup code to log in. Be sure to delete all downloaded backup codes if you’ve turned off 2-step verification. Note: We strongly recommend using 2-step verification for increased account protection. You’ll receive an email confirmation after you make any changes to your 2-step verification setup. You’ll need to log in again before confirming any changes. Hit Change to set up a new device, phone number, or authenticator app, or Remove to turn off 2-step verification. Select Security then Edit under 2-step verification. You can set up a new device, update your phone number, change your authenticator app, or turn off 2-step verification on your account page. If you see the error message "Too many attempts, please try again later", you'll need to wait 30 minutes before trying again. If you can’t access the code sent via text message or generated by your authenticator app, select Want to log in another way? and try using one of your backup codes to log in. Trouble logging in with 2-step verification? You’ll be asked for a code every time you log in to Spotify for Artists or other Spotify web pages. Select Want to log in another way? to switch to your authenticator app or use a backup code instead. If you’ve enabled both text message and an authenticator app, we’ll send your code as a text message by default. ![]() Logging in using 2-step verificationĪfter you’ve set up 2-step verification, you’ll log in to your Spotify for Artists account by entering your password and the code from either a text message we send you or your authenticator app. We hope to roll it out to more users in future. Not seeing 2-step verification as an option?Ģ-step verification is only available to Spotify for Artists users right now. You’ll receive an email confirmation once 2-step verification is activated. We’ll send you an SMS with a 6-digit code.Enter your phone number and hit Send text message.Save your backup codes in a secure place. ![]()
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