The estimation of various social objects is necessary in different fields of social life, science,education, etc. This estimation is usually used for forecasting, for evaluating of different propertiesand for other goals in complex man-machine systems.[...]

Conventional security infrastructures in the Internet cannot be directlyadopted to ambient systems, especially if based on short-range communi-cation channels: Personal, mobile devices are used and the participants arepresent during communication, so privacy protection is a crucial issue....