Is insecurity secure?

How to make data transfer secure? Is it even possible to reach a security level of 100% and if so, is it wise to do so? 
 
Univ.-Prof. Dr. Heinz Oberhummer explains the different kinds of encryptions and tells us about his favorite encryption - the shift cypher. Furthermore the Science Buster narrates the story of Schrödinger's cat and why the output of this experiment is changed by the interventions of the scientist.

Univ.-Lecturer Mag. Werner Gruber explains on the basis of the game theory, that a crime rate of 3 to 5% is best for a efficient society. So a little insecurity is secure - as a security level of 100% causes inattention. And: as higher as the wall is, the easier it is to continue after breaking through.

At last the three Science Busters demonstrate how simple espionage can be, by using a handmade yoghurt-cup-telephone...

The clip (currently only available in German)