What is the strength of the MPJ/Diamond algorithm (Michael Paul Johnson 1989)

I have seen the Diamond2 algorithm in the dlock2 package, with its predecessors MPJ, MPJ2.
This a thesis by Michael Paul Johnson for is Master of Science degree (1989), and a free softwar (date: 12/21/1995).
Schneier's Applied Cryptography doesn't say anything about MPJ or Diamond.
What is its strength?
Jean-Paul Kroepfli
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Jean-Paul Kroepfli writes:
> I have seen the Diamond2 algorithm in the dlock2 package, with its
> predecessors MPJ, MPJ2.  This a thesis by Michael Paul Johnson for
> is Master of Science degree (1989), and a free softwar (date:
> 12/21/1995).  Schneier's Applied Cryptography doesn't say anything
> about MPJ or Diamond.  What is its strength?

Unknown. MPJ is a skilled amateur. However, none of his algorithms
have been rigorously analyzed.

Perry