Re: Lorenz messages

Geoff Sullivan <[email protected]> Mon, 10 Apr 2006 12:43:41 +0100

Newsgroups	gmane.science.cryptography.bletchley-park
Message-ID	<[email protected]>

> My problem is that I only have two authentic Lorenz German input texts.
> Neither of these show suitable pattern recovery statistics. I need more
> texts. Have any of you come across either original German source texts
> or archived decrypts? or know where I might look.
> I need at least 7,000 ch lengths

There is a short stretch of about 1500 characters in The General Report on Tunny. Have you included this? The statistics are quite different to the 4k used in your Colossus Java model. I think rectangling works with the latter text 'doubled up' - I'm sure that's what I used on my PC rectangling trial, which worked OK.


Geoff