GROUP SECURITY IN MACHINE-TYPE COMMUNICATION

摘要

[Technical Problem] If the related secure communication method is applied to the system which includes a plurality of the MTC devices (1101), traffic in a network (1100) would increase in proportion to the number of MTC devices (1101). [Solution to Problem] A communication apparatus (1000) in the present invention, which is connected to a network (1100) and a plurality of communication terminals (1101), includes: a group information sending means (1001) for sending group information, which is received from the network (1100); an access control means (1002) for 1) receiving a reply from the communication terminal (s) (1101) which responded to the group information and 2) sending the reply to the network (1100); and a temporary identifier and group key sending means (1003) for sending a temporary identifier and a group key to the communication terminal (1101) which responded to the group information, when the communication apparatus (1000) received the temporary identifier and the group key from the network (1100).