Github increases SSH requirements
Today I received the following error message when accessing my Github repository on a Windows computer:
Couldn’t agree a key exchange algorithm (available: email@example.com,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521)
After a short research I discovered the reason for this:
The following cryptographic standards considered vulnerable are no longer supported since 22nd Farbruar 2018:
- 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
If you have problems with authentication at github, you should update your git client software!
See also:Weak cryptographic standards removed