"Nature gave us lips to conceal our teeth," ran one popular Victorian maxim, alluding to the fact that before the birth of proper dentistry, mouths were often in a shocking state of hygiene.

Still, it’s difficult for Rosner to conceal his excitement over the fact that hackers are getting interested in his technology—and he admits that he actually has a machine shop in his own backyard.

You tuck your secret away in an unexpected place, like an MP3 or a photo file, to conceal the fact you even shared any information at all.