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?

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Open the private key file and see for yourself? – Daniel Beck Nov 26 '11 at 22:12
See @jhcaiced's response below; that apparently won't work, which is what I feared. – elliottcable Nov 27 '11 at 15:31
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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.

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