An address of a computing device for conducting a transaction with a merchant on an account of an account holder is used to obtain display attributes of the computing device. An authentication request is formatted using the obtained display attributes of the computing device. The formatted authentication request is sent for delivery to the logical address of the computing device. In response to the formatted authentication request, authentication information for the account holder is received from the logical address of the computing device. A validation attempt is performed on the received authentication information for the account holder. If the received authentication information for the account holder was successfully validated by the performance of the validation attempt, the authentication response is transmitted for delivery to a logical address for the merchant.