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