Re: XOR without repeated key

From: Joe Peschel (jpeschel_at_no.spam.org)
Date: 08/28/04 

Date: Sat, 28 Aug 2004 02:37:53 -0000

Guy Macon <http://www.guymacon.com> wrote in
news:10ivaacskv81m6b@news.supernews.com:

>
> Joe Peschel <jpeschel@no.spam.org> says...
>>
>>Guy Macon <http://www.guymacon.com> wrote in
>>news:10iusur26685025@news.supernews.com:
>>
>>> Unless you are correcting Tim Smith's minor omission (the key has to be
>>> random, secret, and used once, not just random)
>>
>>Minor omission?
>
> By "minor" I mean "likely to be assumed by the reader."

Ha! That's quite a definition for "minor."

> for example,
> most sci.crypt posts omit the fact that you should keep your key secret.
>

Yes, I think most sci.crypt readers would grant, in this case, that the key
is secret. What puzzles me is this: why do some of the readers here assume
that the cipher Robert mentions is a one-time pad? All he has said is that
the key is as long as the ciphertext, and the key is XORed against the
plaintext. He hasn't said how that key was generated. He hasn't said that
the key is used only once. Robert's cipher sounds like a stream cipher akin
to RC-4 to me. It could be a classical cipher, too.

J 

-- 
__________________________________________
When will Bush be tried for war crimes?
"Our enemies are innovative and resourceful, and so are we.  They 
never stop thinking about new ways to harm our country and our 
people, and neither do we." --G. W. B.
Joe Peschel 
D.O.E. SysWorks                                 
http://members.aol.com/jpeschel/index.htm
__________________________________________

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