John Young wrote: > James Ellis, GCHQ, in his account of the development of non-secret > encryption credits a Bell Laboratories 1944 report on "Project > C-43" for stimulating his conception: However the concept seems familiar enough - unless I am missing something, a PRNG (n for noise rather than number this time) in sync with a similar PRNG at the recipient end is mixed with the plaintext signal to give a cryptotext; the matching unit subtracts the same values from the received signal to give the original plaintext. If it were digital we would probably xor it :)
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