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References: Your message of "Sat, 15 Feb 1997 17:28:56 PST."            
 <m0vvvPU-0008zXC@agora.rdrop.com>
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Date: Sat, 15 Feb 1997 21:03:53 -0600
To: Poul-Henning Kamp <phk@critter.dk.tfs.com>
From: Richard Wackerbarth <rkw@dataplex.net>
Subject: Re: changing password...
Cc: security@freebsd.org
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>In message <m0vvvPU-0008zXC@agora.rdrop.com>, Alan Batie writes:
>>> Example: to change my my password securely when I had to log in from
>>>another
>>> location.
>>
>>How did you get logged in in the first place?  Either you're using something
>>like ssh and it's all secure, or you're logging in in the clear, and you
>>open it up regardless.
>
>... but wanting to close it right now...

This proposal would allow it.

login: my_name
passwd: Clear_text_1

passwd -c $n$Hash_of_Clear_text_2$

[real work here]
logoff

[next time]

login: my_name
passwd: Clear_text_2

passwd -c $n$Hash_of_Clear_text_3$

[real work here]

etc.