Regular GitHub users are probably aware of the recent GitHub security vulnerability that was exploited by this fellow. You’ve also probably just received instructions via email to audit your SSH keys. An easy way to do this is to run following command on your SSH key(s) stored on your computer:

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ssh-keygen -lf <path_to_your_public_ssh_key>

This will then display the fingerprint of your public key which you can then compare to fingerprint displayed next to your public key on GitHub.

Example:

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ssh-keygen -lf dummy.pub  2048 d3:c7:8d:73:b4:6e:00:5d:ce:c6:85:04:9e:6c:67:51 dummy.pub (RSA)

In this case, the fingerprint is the part:

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d3:c7:8d:73:b4:6e:00:5d:ce:c6:85:04:9e:6c:67:51