[6] The Cheshire Cat is rather pleased; I have set up my Hill cipher with a very elegant encryption matrix he says, it is h 1 2 3 4 i . Are you using (mod 26)? asked Alice. Of course, said the Cat, what else?. Then Im afraid it wont work replied Alice. Of course it will, I have already encrypted with it, grinned the Cat. But you might have two different plaintexts that will encode to the same ciphertext, noted Alice, and then people wont be sure what your message was. Tell her shes wrong, thats impossible! pleaded the Cheshire Cat to the White Rabbit. But he had already scampered off, late as usual. Can you sort this out - could there really be two plaintexts for the same ciphertext?