Re: Some questions about stream cyphers.

From: Mrsjunecarey (mrsjunecarey_at_aol.com)
Date: 06/07/04 

Date: 07 Jun 2004 13:09:57 GMT

>Subject: Re: Some questions about stream cyphers.
>From: Ckwop@hotmail.com (Simon Johnson)
>Date: 07/06/2004 08:41 GMT

>I think the word your looking for is.. *drum roll* Correct?

No.

>
>Brian and Greg happen to be correct that vast majority of the time.

That's not the point.
The point is they're being unpleasant.

>Personally, I have no problem with them at all and I quite enjoy
>reading their posts. They've both contributed to this group several
>orders of magnitude more than yourself.

I have no aspirations to "contribute" to this newsgroup, but if I have then
that's all good huh ?

Speaking of contributions, I was thinking about something last night which I
have decided to share with all of you.

In this thread, Greg Rose has said that there are no biases in what comes out
of /dev/urandom.

Bob Jenkins has said that he's seen generators which pass DIEHARD but don't
have the biases (A)RC4 has (I presume he's talking about the biases documented
on his ISAAC webpage and which I've seen for myself; small gaps of length 2-3).
There are probably other biases aswell.

I have a vague memory that what comes out of /dev/urandom has these kind of
"biases"; small gaps of length 2-3.

If that vague memory is correct (and it might not be) then according to Bob
Jenkins (who knows more about PRNGs than I do) /dev/urandom is biased.

Of course, I could switch on my computer and find out for myself, but I don't
do computing or cryptography anymore and I'm not going back to it.

>
>You might understand the attack better on RC4 if you actually did what
>greg suggested.. Read the paper.

No thanks.

BTW I'm not quite sure what the context of this thread is, but so far it looks
like it has got nothing to do with "attacks" on (A)RC4.

>
>Yours,
>
>Simon.
>
>
>
>
>
>

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