A method for authenticating a counterparty to a digital transaction includes obtaining, at a mobile terminal from a unverified counterparty, characteristic content associated with the digital transaction to be displayed in a trusted user interface provided by the mobile terminal, sending, by the mobile terminal, data associated with the characteristic content to an authentication server; and obtaining, from the authentication server, a result of an authentication judgment by the authentication server, the authentication judgment based on the data associated with the characteristic content and an item of reference content.