Despite the fact that a lot of ways of authentication and access control were invented in the world, only password is the most common and the most vulnerable as well. Many internet portals and services forbid users to create simple passwords for their safety.

On the one hand it a good idea, but on the other hand it is uncomfortable. If we multiply this fact to a dozen of such sites, we will have a real headache. To eliminate the problem between the human factor and data security the aid of password managers is needed, they take on the organization of users' passwords. However, it turns out that the safety of the user depends on a Master Password only.