Subject:
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Re: PW validation (was: Re: Opinions wanted: article rating harmful?)
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Newsgroups:
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lugnet.admin.general
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Date:
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Sat, 22 Apr 2000 18:49:35 GMT
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Viewed:
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7140 times
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In lugnet.admin.general, Jeremy H. Sproat writes:
> In lugnet.admin.general, Todd Lehman writes:
> > In lugnet.admin.general, Richard Franks writes:
> > > Even if you have great passwords - can't just anyone in the intervening
> > > networks between the user and LUGNET just snoop in and copy down the
> > > unencrypted password?
> > As long as it's using http and not https, yes. Once it's in a cookie, it's
> > no longer plaintext, so it's less susceptible to snooping although still
> > susceptible to playback attacks.
>
> Aren't the contents of a cookie simply Base64-encoded? I mean, it's a
> wel-known and reversable format.
No, the last phase of encoding (and thus the first phase of decoding) for
the sign-in cookie is a Base16 (ASCII hex [0-9A-F]) pass. This, however, is
applied to an already-encrypted id/pw combo, which has been passed through a
pad-style encryption which changes each time you ask for a sign-in cookie.
(Thus, you'll never get the same cookie twice even if your password stays the
same.) On the receiving end, after the server decrypts your cookie, it then
reencrypts this data a different way (on the fly) and compares this with the
encrypted version on file in the encrypted-pw table. Thus no raw pw's are
stored anywhere.
--Todd
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