In the intriguing and very cool “Ciphers,” which is getting its American premiere from Inis Nua Theatre Company in Center City, it’s spy versus spy versus spy versus spy. I can’t tell you many details ...

You could do worse than to confuse the meanings of "code" and "cipher"—even cryptographers sometime use the terms as though they had the same meaning. There is, however, a definite distinction between ...

In Part I, you broke a simple cipher. Now try creating a more complex cipher. Cut out the NOVA Decoder Ring and NOVA Cipher Code Ring and the window marked INDEX. You are now going to put this simple ...