From the response it seems that codes and cyphers are a popular subject. It’s late in my day to post now but I will tomorrow (today actually). I have just this/last evening sent for another copy of Mr Singh’s book of secrets but as of now I still haven’t got it so I still don’t know about the plus 1 and minus 1 system of One Off Pad coding. Today I have been busy with plumbing but I will reveal all in my next post.