🚀 go-pugleaf

The easiest way to compromise an exclusive-or cryptographic scheme with
courier-distributed key is to bribe the courier and make a copy.  This
cryptographic scheme is also very inefficient in that you have to
transmit the same amount of data via courier as you do over the
communication link.

As for the "randomness" of radioactive decay counters, I recall that one
was installed on M.I.T. Lincoln Laboratory's TX-2 computer around 1959
and was used for serveral years before someone discovered through
statistical analysis that it was decidedly non-random.  The problem was
traced to an obscure asymmetry in a critical circuit, as I recall.