Anyone know a cool code or cipher?

Question

I'm interested in codes and such, and would appreciate one that I can write and decode quickly. NOT computer codes...

Answer 1

The "Playfair" cipher has a very creditable scientific, historical and literary background. With a well-chosen keyword, it is really quite difficult to break manually.

As the Wikipedia page says, Dorothy Sayers has her detective character Lord Peter Wimsey break a Playfair cipher in the novel "Have his Carcase" or "Have his Carcass". But it is a cheat, because his coded message still has the word spaces left in it, which makes it too easy.

The David Kahn book is the indispensable introduction to cryptography for any even semi-serious amateur.

Answer 2

This is a no. trick. Into a calculator put in abc then repeat so u have abcabc . Now divide by 13 =z. divide z/11=x divide x/7 =abc.
have fun