A method of securing authentication in electronic communication between at least one user authentication mechanism and at least one server authentication mechanism, wherein primary authentication is performed in the first step, and during the primary authentication a secondary authentication secret is created and shared between the user authentication and the server authentication mechanisms and is valid only for the given authentication transaction, and the secondary authentication secret is subsequently used as an input for a cryptographic transformation performed by the user authentication mechanism separately on each authentication vector element while creating the first authentication vector product, wherein authentication vector (AV) is an ordered set of authentication vector elements (AVE)(i)), wherein the first authentication vector product is transferred from the user authentication mechanism to the server authentication mechanism and is evaluated by the server authentication mechanism using the secondary authentication secret.