Esta linha %código% significa que sua chave está protegida por uma senha digitada quando essa chave foi gerada toda vez que você usá-lo, ele pedirá uma senha.
executando ssh-keygen mais uma vez sem digitar a senha que você gerou outra chave. Nenhuma senha na chave - nenhum prompt de senha:)
aqui está uma citação do manpage ssh-keygen:
Normally this program generates the key and asks for a file in which to store the private key. The public key is stored in a file with the same name but ''.pub'' appended. The program also asks for a passphrase. The passphrase may be empty to indicate no passphrase (host keys must have an empty passphrase), or it may be a string of arbitrary length. A passphrase is similar to a password, except it can be a phrase with a series of words, punctuation, numbers, whitespace, or any string of characters you want. Good passphrases are 10-30 characters long, are not simple sentences or otherwise easily guessable (English prose has only 1-2 bits of entropy per character, and provides very bad passphrases), and contain a mix of upper and lowercase letters, numbers, and non-alphanumeric characters. The passphrase can be changed later by using the -p option.
There is no way to recover a lost passphrase. If the passphrase is lost or forgotten, a new key must be generated and the corresponding public key copied to other machines.