Re: Jim Reed's Hagelin Cryptanalysis article

"Jeff Dege" <jdege@xxxxxxxxxxxxxx> wrote in message
news:pan.2007.03.20.00.19.07.671413@xxxxxxxxxxxxxxxxx
In another post, Greg Rose said that the paper was still classified.
Nothing in what I had read of it indicated that had ever been classified -
Ritchie's account describes its status as being somewhat more informal
than that.

Greg misspoke. So far as I know, and Dennis just confirmed, the
paper was never formally classified, in the usual meaning of the term.
Rather, it was voluntarily withheld from publication by its authors.

... provides the people who do know it with a competitive edge.
I knew that was true in 1978. That doesn't mean that it was true today.
I'd hope that modern algorithms were designed to be resistant against it -
even though it's not been published, as DES was designed to be resistant
against differential cryptanalysis.

It's pretty hard to design an algorithm to resist a method that is not
known.. Although there are ways to do just that, they don't seem
to be common practice.

The class of attacks that DES was designed to resist was not precisely
the same as what the public knows as "differential cryptanalysis",
although it happens to cover that.

With respect to Wayne Barker's monograph on the Hagelin, Ritchie suggests
that Barker probably had access to Reeds' notes, but "missed their main
point". Is it possible that Barker understood "the main point," but kept
it private, for the same reasons that Reeds et al. had?

I don't know. If Wayne is still alive, you could probably reach him
via Aegean Park Press and ask him. My *guess* is that Wayne
really didn't fully grasp the method. Certainly, nothing comparable is
covered in his book.

In any case, is there a better publicly-available source on cracking the
Hagelin than Barker's?

I don't recall anything of real value in the open literature, although
I haven't read all of it. I did check the index for Cryptologia through
1996, and found nothing on the matter.

I was informed that NSA did declassify more of MilCryp Part III,
although I don't yet have a copy of the latest public release (hey,
Charlie, where is it?) and there is a slim chance that some Hagelin
techniques were included, but from past experience I doubt they
would have been.

Here is an opportunity for you to make a publishable discovery!
Consider: regular wheel cycles with known periods => Fourier
analysis ought to be applicable in some way.


.

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