FIELD: authenticating users in currency exchange. SUBSTANCE: method for authenticating at least one user in data exchange between at least two users includes transfer of first data (request) from first user to second one; the latter processes first data (request) by using first algorithm to obtain second data (response) and conveys them to first user who checks response for correctness. At the same time at least one more processing of first data (request) is made for processing first data (request) by using first algorithm. EFFECT: maximizing secrecy of type of authenticating method used. 7 cl, 1 dwg
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