What is an OpenSSH keyfile?

We authenticate non-fas users via RSA/DSA keys. You can generate a public/private key pair as follows:

Unix (including Macs): type
ssh-keygen -t dsa
into a terminal prompt ("Terminal" on Macs), and it will run you through the process (selecting the default settings/values is fine). The OpenSSH keyfile, also known as the public key, is the long string of random characters that gets printed to the screen at the end (also found by default at ./.ssh/id_dsa.pub)

Windows: SecureCRT can do it, under Tools>Create Public Key...

Not sure how to make this work? We now have an in-depth tutorial on setting up OpenSSH keys with your HCS account.