The grand challenge will be the control of human lifestyles. As due to technology, the whole lifestyle is changed, may someone belongs to any civilization of category. Everybody is fully effected by modern computing and the latest innovation. That changed people from day to day activities. So the biggest challenge would be the control of this sudden change in lifestyle. Although cognitive services are helping people but the challenge would be to facilitate people by keeping the direction right.
A super secure Password is very common nowadays. Although according to experts