FIELD: identifying users in various service systems and authorizing them including acknowledgement of their solvency or sound reputation. SUBSTANCE: proposed method makes it possible for user to dispense with additional hardware and software by way of facilitating user's data exchange with servicing and trust agency. Personal communication device such as mobile phone alone is used for data exchange between user and trust agency. Protectability of the latter rises due to the fact that user's disposable dynamic identifier is first conveyed to user and that dynamic length of disposable identifiers is inputted. EFFECT: enlarged functional capabilities. 4 cl, 1 dwg
