GitHub this week permanently disabled a series of weak cryptographic standards across its software development platform in an attempt to better protect users.
As of Feb. 22, 2018, the TLSv1/TLSv1.1 standard is no longer used on HTTPS connections to GitHub. The change affects all web, API, and git connections to https://github.com and https://api.github.com, Patrick Toomey, Application Security Engineer, GitHub, says.
The platform also retired the diffie-hellman-group1-sha1 and diffie-hellman-group14-sha1 encryption standards, a move that affects all SSH connections to github.com. This change follows the enabling of the diffie-hellman-group-exchange-sha256 standard on GitHub in September 2017.