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Article #1689

Re: New Encryption Method - A Challenge!

#1689
From: Keith C. Thompson
Date: Sat, 14 Nov 1992 01:56
48 lines
2692 bytes
In article <n0e48t@ofa123.fidonet.org> Erik.Lindano@ofa123.fidonet.org writes:
> 
> Well, I said I wouldn't, but I went and read Loen's long FAQ post 
> anyway. Just to show that I am equanimous. According to what I glean 
> from his words, decrypting NuCrypt output should be an absolute, 
> total, unmitigated pea-soup task for any self-respecting 
> cryptologist (-grapher?). The challenge opened widely nearly every 
> fundamental avenue of attack, as mentioned in Loen's post: 
> 
>  2. "Known plaintext" attack.  The NuCrypt challenge offers complete 
>      availability of the original plaintext, except one word or two. 
>      You are only asked to decrypt this ONE WORD or TWO, nothing 
>      more! Plain English. Eight chars. Piece of cake.

Well, technically this is not a "known plaintext" attack that you are
offering.  The idea with a known plaintext attack is to recover the
key, not part of the plaintext.  This sort of misunderstanding on your
part is what is driving the reaction that you are seeing.  Sorry to
be so blunt.

>      
>  3. "Chosen plaintext" attack. Analysts have been invited to submit 
>      plaintext of their own choosing - 99%!  Only ONE unknown word 
>      would be ebedded in your own plaintext, and the whole then
>      encrypted. You are only asked to decrypt this ONE WORD having
>      both the plaintext and ciphertext of ALL OTHER WORDS. What 
>      could be easier?

See the comments above.  Same problem.

>  6. To make things REAL easy, you've been asked to suggest any other 
>     input or test method of your own choosing.

Well, I have.  You did not respond to my email, although I have no
way of knowing if you received it, but I have received no responses.

>  
> Ach, meine Damen un Herren... all these cryptomancers, I mean, 
> cryptopterists, and no takers!  No takers... shame.  People here 
> seem to have a very low cryptolibido.  Lack of cryptamines, maybe.  
> 
> My friend says he's considering adding the cost of a roundript ticket
> to New York City to the wining-and-dining prize.

Well, he is getting closer to the point were somebody is going to take
him up on it.

- Keith
Technical Details
Message-ID: <1992Nov14.015610.11789@nas.nasa.gov>
Path: arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!ames!data.nas.nasa.gov!sun425.nas.nasa.gov!thompson
References: <n0e48t@ofa123.fidonet.org>

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From: thompson@sun425.nas.nasa.gov (Keith C. Thompson)
Subject: Re: New Encryption Method - A Challenge!
References: <n0e48t@ofa123.fidonet.org>
Sender: news@nas.nasa.gov (News Administrator)
Organization: NAS, NASA Ames Research Center, Moffett Field, California
Date: Sat, 14 Nov 92 01:56:10 GMT
Message-ID: <1992Nov14.015610.11789@nas.nasa.gov>
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