Abstract: The invention relates to a method of authentication for a provider comprising requesting a verification system for authentication of a transaction initiated by a user by transmitting to the verification system details of the transaction initiated; requesting the user to authenticate the transaction on a mobile device by transmitting to the user mobile device details of the transaction; validating the authentication request received from the verification system on the mobile device and prompting the user to enter a personal identification number, displaying to the user transaction details on receiving a valid personal identification number and requesting user to authenticate transaction; generating on receiving user authentication an authentication parameter for transmission to the verification system; and authenticating the transaction to the provider on receiving a valid authentication parameter from user mobile device.