2 step verification is a setting to help secure your niconico account from illegal logins.

When your 2 step verification is turned on, your account becomes better protected through
a confirmation system that utilizes your password, smartphone and email address.
 When you turn on your 2 step verification, you will need to enter your password along with
a 6 digit (confirmation code).




Once your confirmation code has been verified on your PC or smartphone, you can
skip the code entering step the next time you log in.
Your confirmation code can be acquired by the following methods:

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Issue via smartphone
Install the 2 step verification app (Google Authentication or a compatible app)
onto your smartphone to issue.

Issue to registered email address
Allow Niconico to send you an email with the confirmation code.

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Even if your password becomes compromised by a third party, the confirmation code
will inhibit them from accessing your niconico account, providing you with
maximum security. 

Please note that when the 2 step verification is turned on that you will not
be able to obtain a confirmation code ( for reasons stated below) nor login to Niconico.
Therefore, we advise you to create your backup codes beforehand.

(Ex) Smartphone issued confirmation codes:
You will be unable to obtain your confirmation code if your 
     
・smartphone has been lost
・smartphone has been broken
・smartphone has been discarded after upgrading your smartphone model 

(Ex) Email issued confirmation codes:
You will be unable to obtain your confirmation code if your 

・ email address has become invalid
・ email address is no longer able to receive emails

What are backup codes?

Backup codes are used for logging in to Niconico when you have become
unable to obtain a confirmation code.

Please be sure to create a set of backup codes as soon as you turn on the 2 step
verification and then write or print them out for quick recall when needed.

Be sure also to keep your backup codes in a safe place to prevent
illegal access of your account by third parties.

 

 

Once you have successfully created your backup codes, they will appear on screen (as shown below).

Please be sure to store your codes in a safe place after recording them.

 

Recreating backup codes

When you begin running low on backup codes, click the re-create button (shown above)
 to create new backup codes.

Once you have re-created your backup codes, all of the older codes will  become invalid.

Therefore, we advised to you immediately write down or print out your new backup codes
in addition to discarding the older ones.