SSH keygen under Cygwin

You will need to install the "openssh" package using the Cygwin installer before doing this.

Notes:

• In the near future, OpenSSH is deprecating support for DSA keys.
• Minimum supported RSA key size will be 1024 bits, but you should really do 2048 or larger.

Typical steps for creating SSH keys:

$ mkdir ~/.ssh

$ chmod 700 ~/.ssh

$ cd ~/.ssh

$ ssh-keygen.exe -t rsa -b 3200 -C 'Borg backup key thomast61p July 2015' -N '' -f ~/.ssh/ssh-borg-backup-july2015

In this particular case, I am creating a RSA/3200 key with no password (-N '') and with a comment indicating that it will only be used for Borg backups.  Because the key has no password, I should only use it in conjunction with the borg backup command on a separate server-side account that has very limited permissions on the server.