Perhaps you could show the ciphertext page and then have a script operate when the password (or button-click) is entered that alters the style of the ciphertext parts so that they use the key font instead. Extra marks if you use jQuery to fade through several font 'keys' before presenting the plaintext. Also preload the font files.
Comments
Sorry, from the comments it's apperent that this was a horrible demo.
Perhaps you could show the ciphertext page and then have a script operate when the password (or button-click) is entered that alters the style of the ciphertext parts so that they use the key font instead. Extra marks if you use jQuery to fade through several font 'keys' before presenting the plaintext. Also preload the font files.
IMO that'd be cool.