Secure Linux air gap. Here is a real secure Linux air gap: 1. From a friend's computer, burn two copies of your favorite Linux liveCD. 2. Hold the two identi

Secure Linux air gap. Here is a real secure Linux air gap: 1. From a friend's computer, burn two copies of your favorite Linux liveCD. 2. Hold the two identical discs so that you can see the reflection of the document in front of you in one (mirror writing) and the reflection of the reflection in the other. (normal writing.) 3. You now have a secure Linux air gap with which you can read any document.