Abstract: The present invention provides computer-enable certification and authentication in, for example, e-commerce with wireless and mobile devices. The present authentication method offers ease of operation by automatically embedding a one-time passcode to the message without the sender input. A one-time key can also be used to encrypt the message, further providing transmission security. In addition, sensitive information and one-time passcode generator are pre-arranged and stored at both sender and receiver devices, avoiding information comprising in wireless environment transmission.