Re: Looking for Unix-based POP3 server implementing APOP

Mark Crispin <MRC@cac.washington.edu> Sun, 25 September 1994 22:06 UTC

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Date: Sun, 25 Sep 1994 14:51:10 -0700 (PDT)
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From: Mark Crispin <MRC@cac.washington.edu>
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Subject: Re: Looking for Unix-based POP3 server implementing APOP
To: Glenn Anderson <glenn.anderson@library.otago.ac.nz>
Cc: Skip Montanaro <skip@automatrix.com>, ietf-pop3@andrew.cmu.edu
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On Mon, 26 Sep 1994 08:34:05 +1200, Glenn Anderson wrote:
> Unfortunately it is technically impossible to implement APOP on unix
> because unix uses a one way encryption method for passwords. This means
> that the POP3 server can not get a clear text version of the password which
> is required for the APOP algorithm.

This is not quite accurate.

It is not technically impossible to implement APOP on Unix, unless there is a
requirement to use a UNIX login user's password from /etc/passwd.  It is not
necessarily the case that POP authentication credentials have to match UNIX
login user authentication credentials (although that *is* what many POP and
IMAP implementations use).