I know I can simply open up the pubkey and change the comment after the
==s, but is the comment field decided upon at creation stored in the private key as well? If so, how can I change that field without generating an entirely new key from scratch?
I just did a small test modifying the "Comment:" line of my private RSA key and it appears to be fixed at creation of the key.
It is a RSA key generated with Putty, and after modifying the comment in the key, the passwd did not work, i have to reverse the edit to the same original comment for it to work again.