A proper law

[David Hansen]

On 6 Mar 2003 at 16:10, Brian Gladman wrote:

> The most
> spectaculer own goal was the reflection of the signal back through the
> rotor system. This was a classic, since repeated many times, in which
> a step that seems to improve security has exactly the opposite effect
> (a sin I have commited myself more than once).

The one that still fascinates me is how the plugboard was made 
essentially irrelevant, by the diagonal board IIRC (I must read up 
again some time). Even Alan Turing was stunned by that idea.


--
  David Hansen, Edinburgh | PGP email preferred-key number F566DA0E
 I will *always* explain why I revoke a key, unless the UK 
 government prevents me using the RIP Act 2000.