In article <[EMAIL PROTECTED]>, MCKAY john
<[EMAIL PROTECTED]> writes
>Another curiosity of the Mark I's instruction set was a sideways
>add ('population count'), also specified by Turing. I've always
>assumed that the two instructions could be useful for cryptography -
Think about how the Bombes worked. You injected signal into one line,
and wanted to know when it didn't come back on all of the other 25. A
software implementation of this could use a population count to
advantage.
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