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Today we're adding two-factor authentication to GitHub.

When you enable this feature, it adds an additional layer of security to your
account. When logging in to GitHub, after providing your username and password,
you will be asked for a two-factor authentication code that is delivered to
your mobile device via SMS or a free two-factor application. This additional step
ensures that a malicious person who has discovered your password will not be
able to log in to GitHub as you.

How do I enable it?

You can find a link in your account settings.

Settings link

You can find more information about setting up two-factor authentication on
the documentation page.

Enabling this feature will affect more than just your GitHub.com login
experience. Visit this help article
to learn how two-factor authentication works with HTTPS Git, GitHub for Mac,
GitHub for Windows, and the API.

How does it work on GitHub.com?

After entering your username and password, you will be prompted for a
two-factor authentication code.

Prompt

This code can obtained from your mobile device through one of two methods:

After entering the code, you will be logged in.

How does it work for command-line Git?

If you are using SSH for Git authentication, rest easy: you don't need to do
anything. If you are using HTTPS Git, instead of entering your password, enter
a personal access token. These can be created by going to your
personal access tokens page.

Personal Access Tokens

How does it work in GitHub for Mac and GitHub for Windows?

After entering your username and password, you will be prompted for a
two-factor authentication code.

GitHub for Mac
GitHub for Mac

GitHub for Windows
GitHub for Windows

What if I lose my mobile device?

We provide a number of recovery options, including recovery codes and backup
SMS numbers. See this help article for more information.

Recovery Codes

Enjoy the newer, more-secure GitHub!

Have feedback on this post? Let @github know on Twitter.

Need help or found a bug? Contact us.