FIELD: physics, computer engineering.SUBSTANCE: invention relates to a method of executing business transactions and performing agreement signing operations, as well as retrieving identification information. The invention discloses a method and a system which employ a USSD (unstructured supplementary service data) protocol to enable a user to execute business transactions and agreement signing operations, as well as to retrieve identification information using a secure method.EFFECT: high reliability of executed transactions.6 cl, 9 dwg
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