Method and system for transmitting and receiving data, method and device for processing message

A system for transmitting and receiving data, comprising:

• a relay server;
• the relay server comprises a processor and a memory, and the processor is configured to execute program components stored in the memory, and the program components comprise:
• a first receiving component configured to receive an assignment request message from a first User Equipment, UE, wherein the assignment request message is used for obtaining, by the first UE, authorization from the relay server, and the authorization is used for permitting the first UE to transmit and/or receive data via the relay server;
• an authentication requesting component configured to request a service server to authenticate the first UE according to the assignment request message;
• an authorizing component configured to, in the case that the service server authenticates the first UE successfully, permit the first UE to transmit and/or receive data via the relay server;
• a calculating component configured to add information of an account which is registered on the service server to an assignment request message, and calculate the assignment request message according to a preset algorithm;
• an encrypting component configured to use an account password corresponding to the information of the account to encrypt a result of calculation;
• and
• a sending component configured to add a result of encryption to the assignment request message, and send the assignment request message to the relay server.