Let me remind everyone again not to lose your key, email it to yourself, write it down, NB the mod so you can just reopen it, whatever. Make sure you pick a Key word or words that are fairly recognizable and relevant, something like 'Long Live King Duncan!' or 'RAFO rocks!'. Additionally you want to pad it, if you just put 'Ross' in as your cipher it will make it pretty easy to guess and warn an impostor of using it, something like 'Iamrossxyz' is better'

And if you decide not to use Vigenere, keep it easy, remember one of us will have to check it and 'us' usually means 'me'. Just go for something easy like converting you letters to numbers and adding the digits of Pi or a number-conversion of your own name or favorite actor or something like that.