Abstract: A communication system that obtains a key includes: a server that confirms support of Identity Based Encryption (IBE) authentication; the server obtains public parameters and a private key for IBE; and the server receives a PreMasterSecret key encrypted through the IBE, and obtains a plain text of the PreMasterSecret key according to the public parameters and the private key. The system includes a client and a server. The client includes an IBE negotiating module, a public parameter obtaining module, a server identifier obtaining module, and a processing module. The server includes an IBE negotiating module, a public parameter obtaining module, a private key obtaining module, and a processing module. Through combination of the IBE technology and the SSL/TLS technology, the modes of encrypting a PreMasterSecret key in the existing SSL/TLS protocol are diversified, and the use scope of the existing SSL/TLS protocol is extended substantially.

Abstract: In the field of communications technology, a method and a system for forwarding data between private networks are provided, which can enable terminals in different private networks to securely communicate with each other by using private network addresses. The method includes the following steps. A Secure Socket Layer (SSL) tunnel to an SSL Virtual Private Network (VPN) device in another private network is established. Address allocation information of the another private network is received through the SSL tunnel. The address allocation information and a mapping relation between the address allocation information and a public network IP address of the SSL VPN device transmitting the address allocation information and a session ID of the SSL tunnel transmitting the address allocation information are saved.

Abstract: In the field of communications technology, a method and a system for forwarding data between private networks are provided, which can enable terminals in different private networks to securely communicate with each other by using private network addresses. The method includes the following steps. A Secure Socket Layer (SSL) tunnel to an SSL Virtual Private Network (VPN) device in another private network is established. Address allocation information of the another private network is received through the SSL tunnel. The address allocation information and a mapping relation between the address allocation information and a public network IP address of the SSL VPN device transmitting the address allocation information and a session ID of the SSL tunnel transmitting the address allocation information are saved.

Abstract: A communication system that obtains a key includes: a server that confirms support of Identity Based Encryption (IBE) authentication; the server obtains public parameters and a private key for IBE; and the server receives a PreMasterSecret key encrypted through the IBE, and obtains a plain text of the PreMasterSecret key according to the public parameters and the private key. The system includes a client and a server. The client includes an IBE negotiating module, a public parameter obtaining module, a server identifier obtaining module, and a processing module. The server includes an IBE negotiating module, a public parameter obtaining module, a private key obtaining module, and a processing module. Through combination of the IBE technology and the SSL/TLS technology, the modes of encrypting a PreMasterSecret key in the existing SSL/TLS protocol are diversified, and the use scope of the existing SSL/TLS protocol is extended substantially.