What's the difference between id_rsa.pub and id_dsa.pub?

Question

Is one more secure than the other?

Answer 1

One uses DSA and one uses RSA.

Answer 2

id_rsa.pub and id_dsa.pub are the public keys for id_rsa and id_dsa. If you are asking in relation to SSH, id_rsa is an RSA key and can be used with the SSH protocol 1 or 2, whereas id_dsa is a DSA key and can only be used with SSH protocol 2. Both are very secure, but DSA does seem to be the standard these days (assuming all your clients/servers support SSH 2).