I'm analyzing a piece of encryption shareware advertised on comp.archives.msdos.announce.

Could you post a more complete pointer to this?

PARTICULAR TOOLS I'D USEFUL... - A binary file editor/composer with hex and ascii displays - A tool for generating and viewing letter frequencies, digram/ trigram frequencies

Since you are going to be writing some of these, presumably, I take it you'll be sharing your code with us. Yes?

I looked on soda in pub/cypherpunks/cryptanalysis and found nothing useful.

The directory is there as much to inspire the writing of such software as it is to distribute it. Eric