Re: Humble Contribution
From: Brian Ross (brian.ross.x_at_rogers.com)
Date: 01/30/04
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Date: Fri, 30 Jan 2004 00:55:56 GMT
"Paul Rubin" <http://phr.cx@NOSPAM.invalid> wrote in message
news:7xr7xi9s5u.fsf@ruckus.brouhaha.com...
> "Brian Ross" <brian.ross.x@rogers.com> writes:
> > Tell me what the hash of 'X' | 'Y' is where Y = "abcde".
> > (X | Y will be 10 bytes)
>
> Brian, do you know how md5 works? If yes, you should be able to
> answer your own question easily. If not, it's better for you to go
> learn about it than bother other people with these "challenges".
Yes - that is why I am asking the question. I do not believe what you are
saying is possible. (See my other message)
> Also, the message extension attack doesn't let you set Y to whatever
> you want, like "abcde". Y has to have a specific format.
I now think I can see where you are headed... Y has to be prefixed with the
padding bytes and length of X?
In that case I believe I agree - you can choose a Y that will fit that
criteria.
> Actually crunching out an example can be done straightforwardly by
> modifying an md5 implementation to set the magic constants from your
> example, followed by some banging around to get all the little details
> right, probably about an hour of hacking to be on the safe side.
> Who's that supposed to be worth the effort to, unless they're getting
> paid?
It shouldn't require writing code or running some examples to try to
explain/prove what you are saying but I believe I now understand what you
are claiming. When I read what you were saying before - I took it to mean
that you can find the hash of X | Y of _any_ value of Y. I didn't get the
impression that you were placing restrictions on what Y had to look like.
Brian
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