[comp.misc] XOR cursor

jejones@mcrware.UUCP (James Jones) (03/15/91)

In article <118831@philabs.Philips.Com> aeb@briar.philips.com.UUCP (Anne Barschall) writes:
>You can bet that no one was able to prove that the technique was used before
>Cadtrak applied for a patent, otherwise the patent would NOT have stood up in
>court.

The fact that X exclusive or X = 0 is the basis of the Vernam cipher, which
has been in wide use since the 1930s.

	James Jones