"True, doenitz had some suspects (he ordered the fourth rotor in enigma machine) but at the same time he was the person most involved in the problem. I think he should have had more than "suspects". He had in his hands all the clues to get a clear picture of the situation and eventually take effective countermeasures."

The number of rotors was increased more than once. Changes were made in the methods for key settings, the Stecker plugboard was added early on. The Germans did not think the Enigma machine was impentrable, just very difficult. They thought frequent small changes were sufficient to render Allied efforts ineffective. Fortunatly they failed to understand several things.

1. the Poles had figured out the underlying mathmatics of the system and before the war built several effective decoding machines (the Bombe version).

2. The operator procedures, and the methods for organizing the messages, were flawed and greatly eased entry into te message key. This was endimic in all branches of the German military and security services.

3. The British had developed a industrial scale system for processing the radio intercepts enmass. Amoung other things the Germans thought the important messages would be indistiguishable from the trivial, complicating efforts to decode them. The Brits developed methods for sorting which messages were from important senders and for assigning priority. The German radio signals intel had some sucesses, but overall it was fragmented, disorganized, and using methods often obsolete by Allied standards. They had no comprehension of the scale and capability of the Bletchly Park facilty and the many other Allied facilitys.

4. Deception. The Brits had captured all or most of the spys infiltrated into Britian. Through their double cross organization they dribbled all sorts of false information back to the German intel services. Amoung this were bits about how various submarines were sunk. The German intel analysists concluded that the submarine were being located via air reconissance, sonar, and aggressive hunter packs of surface ships. Any information released concerning radio signal intel were designed to turn attention away from encryption failure.

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