[GreenKeys] [External] Two-tape TTY for crypto

[Jim Haynes]

On Tue, 13 Oct 2020, Jones, Douglas W wrote:

> Hand-made key tape?  No!  You put the English and French tapes on the 
> 2-input XOR device and let it combine them to make the key tape.  That 
> key tape, input with the English will make French, and visa versa.
>
Well, all I meant was that the key tape was not a real random key, but
one specially constructed to do the job.