When I execute these commands (setting a passphrase, after the first)...
$ ssh-keygen -t dsa
$ chmod 600 my_key
$ chmod 600 my_key.pub
...and then, to test the passphrase...
$ ssh-add my_key.pub
...I keep getting:
Bad passphrase, try again for my_key.pub:
Bad passphrase, try again for my_key.pub:
Bad passphrase, try again for my_key.pub:
Bad passphrase, try again for my_key.pub:
...
What am I doing wrong?
You're trying to add public key to the agent, that one isn't pass-protected, the private one is. Try adding your private key and it should work.
来源：https://stackoverflow.com/questions/20617660/ssh-bad-passphrase-after-generation-of-public-key