@Heir, I put (almost) everything I knew 2 years ago into a very long document. It can be found in the BOSS library or
in the training materials, I forget which. And a good book is Gaines, Cryptanalysis. Only $14 on Amazon. Don’t know the price in metric.
[Gaines’ book is out of copyright and now available as a pdf in the library. Just click on the cover! Harry]