Discontinue support for weak cryptographic standards

GitHub is announcing the immediate deprecation, and eventual disablement, of our use of the following cryptographic standards:

• TLSv1/TLSv1.1 - This applies to all HTTPS connections, including web, API, and Git connections to https://github.com and https://api.github.com.
• diffie-hellman-group1-sha1 - This applies to all SSH connections to github.com.
• diffie-hellman-group14-sha1 - This applies to all SSH connections to github.com.

All of the above will be disabled on February 1, 2018.

For full details on the deprecation, please see our GitHub Engineering blog post.

As always, if you have any questions, please get in touch.