■This course does not aim to teach you how to crack a system only
■There are other courses organized by other people to teach you to crack a system only but usually they are taught by those that do not know security (and even how to crack a system J )
■The real challenge is to teach (and to learn) how to build a system that cannot be cracked ie learning how to crack a system is useful only to defend a system
■In the dark web, criminal gangs are offering to those that can build a robust system a larger amount of money than the one they offer to those that can attack a system