Re: The Elevator Problem

At 6:47 PM 12/8/95, Jerry Whiting wrote:
>A group of us have been wrestling with a problem and I'd like to ask for some
>outside help.  We've come to call it the Elevator Problem.
>
>Alice and Bob want to establish a secret in from of Eve.  In other words,
>they want to agree on a secret key in an elevator full of Eve's.

Isn't this just the "subliminal channels" scenario? Originally phrased in
terms of prisoners under the watchful eyes of their jailers nevertheless
establishing a private communication channel?

Schneier describes this beginning on page 66 (of his 1st edition).

Your scenario looks identical to this. So you should check out the papers
on this in the Crypto Conference proceedings.

As to whether you can implement this without using patented algorithms, I
don't know. Not enough information given.

--Tim May

Views here are not the views of my Internet Service Provider or Government.
---------:---------:---------:---------:---------:---------:---------:----
Timothy C. May              | Crypto Anarchy: encryption, digital money,
tcmay@got.net  408-728-0152 | anonymous networks, digital pseudonyms, zero
Corralitos, CA              | knowledge, reputations, information markets,
Higher Power: 2^756839      | black markets, collapse of governments.
"National borders are just speed bumps on the information superhighway."

Would it be possible for the Cypherpunks mailing list remailer to parse the 
Subject line to include a CP: at the beginning, or some notation so that 
Cypherpunk messages can be easily 'filtered' out from my Inbox?

Also, about Microsoft's .PWL file format. Will they be releasing the 
new encryption method? Or are we not supposed to feel safe that our 
passwords are protected in Windows95.

On Fri, 8 Dec 1995, Laszlo Vecsey wrote:

> Would it be possible for the Cypherpunks mailing list remailer to parse the 
> Subject line to include a CP: at the beginning, or some notation so that 
> Cypherpunk messages can be easily 'filtered' out from my Inbox?

Majordomo always includes a Sender: owner-cypherpunks@toad.com header. 
You'd know this if you used, say, Microsoft Exchange, Microsoft Mail, or
some other broken mail gateway. Procmail or whatever should be able to 
filter mail based on this.

You can also read cypherpunks courtesy of http://www.hks.net/ (no,
Cyberia-L isn't there), or nntp.hks.net. Lots of people do this. I prefer
to deal with receiving the list in my personal mailbox because I don't
like waiting for downloads in real time. 
 
> Also, about Microsoft's .PWL file format. Will they be releasing the 
> new encryption method? Or are we not supposed to feel safe that our 
> passwords are protected in Windows95.

I asked a related question of one of the networking program managers 
today; I think the answer is yes. I'll forward this to see if he'd like 
to make a public comment.

-rich

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On Fri, 8 Dec 1995, Laszlo Vecsey wrote:

> Would it be possible for the Cypherpunks mailing list remailer to parse the 
> Subject line to include a CP: at the beginning, or some notation so that 
> Cypherpunk messages can be easily 'filtered' out from my Inbox?

I sort mine using the "sender:" tag.  Works like a charm.

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____           Robert A. Hayden      <=> hayden@krypton.mankato.msus.edu
\  /__     Finger for Geek Code Info <=>    Finger for PGP Public Key
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R+++>$ tv+ b+ DI+++ D+++ G+++++>$ e++$>++++ h r-- y+**
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On Fri, 8 Dec 1995, Laszlo Vecsey wrote:

> Would it be possible for the Cypherpunks mailing list remailer to parse the 
> Subject line to include a CP: at the beginning, or some notation so that 
> Cypherpunk messages can be easily 'filtered' out from my Inbox?

Um, it already does.

Learn procmail. It'll save you hours upon hours of time.

:0:
* (^From owner-cypherpunks@toad\.com|^Sender: owner-cypherpunks@toad\.com)
lists/cypherpunks

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I use mh and slocal and .maildevilry-- er.. 
I mean .maildelivery.  It seems to have a much less steep
learning curve than procmail does, and it does everything
that I need it to do.


Bryce

signature follows



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set up and run 'procmail'  --you can create folders for each list, or 
you can relegate whatever else with great flexibility to /dev/null/. 
additionally, procmail allows piped commands through external processes.

   there is absolutely no need to add CP to "Subject:"

	<attila>


On Fri, 8 Dec 1995, Laszlo Vecsey wrote:

> Would it be possible for the Cypherpunks mailing list remailer to parse the 
> Subject line to include a CP: at the beginning, or some notation so that 
> Cypherpunk messages can be easily 'filtered' out from my Inbox?
> 
> Also, about Microsoft's .PWL file format. Will they be releasing the 
> new encryption method? Or are we not supposed to feel safe that our 
> passwords are protected in Windows95.
>