They say that there is no password in the world that is indecipherable, although it is true that we can create an almost perfect password. Moreover, we have to keep in mind basic rules that a perfect password should follow. The first one, and also the most important, it must be very easy to remember; and the second one, we take a careful look at length. They recommend a minimum of twelve characters. Therefore, the use of words has several factors of risk: short extension and facility to be found in a dictionary.