From: rishab@dxm.ernet.in (Rishab Aiyer Ghosh)
Date: Thu, 9 Feb 95 23:09:20 PST
To: cypherpunks@toad.com
Subject: Re:  Selection key crypto protocol trial balloon
In-Reply-To: <9502082007.AA09524@anchor.ho.att.com>
Message-ID: <awLe2c4w165w@dxm.ernet.in>
MIME-Version: 1.0
Content-Type: text/plain


wcs@anchor.ho.att.com writes:

> > Um no. The main thing is that what is extracted with the selection key is
> > _different_ from what was put in...
> 
> But the only things the selectioon key can extract are what the senders
> put in plus what the system did to it once it was there, which is not
> informationally different than what the senders put there.

True, just as ciphertext is not different, informationally, from plaintext.
It's just a pair of transformations, both by the system, one in response to
the sender and the other in response to the receiver. A bit like an airlock -
if the two transformations are the right ones, extraneous information such as
the identity should not pass through.

> I suppose you could play some games by sending the message in 
> multiple parts, with parts sent by 1-way anonymous remailer,
> but there's still a certain amount of traffic analysis you can do.
> 
> 	Bill


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