It's a good idea to keep your public keys private. You can do this by using a different key for each purpose, and by explicitly configuring (in ~/.ssh/config) which key to use for which purpose.
By default, the ssh client will try to each of your public keys to connect to any given server, which naughty servers can effectively use to enumerate your identities.
Services like Github really shouldn't publish these keys without consent. One could argue they're really PII and subject to privacy laws ..
That's a good point. The wording makes sense from a cryptographic point of view, but it doesn't really convey the full meaning outside of that context.
By default, the ssh client will try to each of your public keys to connect to any given server, which naughty servers can effectively use to enumerate your identities.
Services like Github really shouldn't publish these keys without consent. One could argue they're really PII and subject to privacy laws ..