Abstract: A system for enhancing payment security includes a payment network interface unit for communicating with a POS terminal through a payment network; a database for storing a card number and password of a payment tool of a user and a number of a mobile terminal of the user associated with the card number; an acquiring means for searching in the database to obtain the number of the user's mobile terminal associated with the card number; a receiving/sending unit for sending, according to the obtained number of the user's mobile terminal, a request for a transaction password of the payment tool to the user's mobile terminal by means of a wireless network; and an authentication means for authenticating whether or not the transaction password of the user's payment tool returned from the user's mobile terminal matches with the password stored in the database.

Abstract: Provided are message sending and receiving devices and methods for distributed authentication as to whether a received message is sent by a service registered with a service provider. Among the devices and methods, the message receiving device receives a message of service sent by a message sending device and provided by a service provider; and according to the information of services registered with the service providers stored locally, authenticates whether or not the message is sent by a service registered with the service provider and stored locally; the message sending device receives a service message sent by a service provider to a message receiving device; sends the message of service to the message receiving device; and sends the information of services registered with service providers by the message receiving device to the message receiving device.