“Usability or security: Do we really have to choose? At times the two seem immutably bound. Make it more secure, goes the belief, and as night follows day, things become harder to use. It is a never-ending challenge, with security experts pitting themselves against usability experts, and both fighting with the engineers and marketing representatives—all convinced that their view is the most important, each convinced that attention to the others defeats their goal.” (Donald A. Norman – ACM SIGCHI Interactions Magazine XVI.6)