Communication system, communication device, vehicle and communication method

A communication device comprising an RF module for communicating with a server and for communicating with other communication devices over a network,

• wherein the communication device stores an IP address that includes a pseudorandom number that has been generated by using a value generated with an irreversible compressibility function on a basis of area information and a random seed that has been issued from the server under a secure environment as a seed,
• wherein the communication device further accesses time information,
• wherein the pseudorandom number is generated by using a value generated with the irreversible compressibility function on a basis of the area information, the time information, and the random seed, the area information and the time information being different from the issued random seed,
• wherein the communication device authenticates, as a communication object, another communication device that includes an IP address including a same pseudorandom number as its IP address, and
• wherein the communication devices share the irreversible compressibility function in each of the communication devices to generate the value.

A communication method in a communication system in which a plurality of communication devices is coupled together such that a mutual communication is possible over a network and each of the communication devices is coupled with a server such that communication with the server is possible, the communication method comprising:

• receiving an authentication request by the server from one or more of the communication devices under a secure environment;
• authenticating, by the server, the one or more communication devices;
• issuing, by the server, to individual ones of the one or more authenticated communication devices pseudo seeds having a same value, each of the communication devices having its own area information;
• and
• generating, in each of the one or more authenticated communication devices, an IP address that includes a pseudorandom number generated by using a value generated with an irreversible compressibility function on a basis of the area information, time information, and the random seed as the seeds issued by the server and an identifier that has been issued to the communication device itself;
• establishing, by the one or more authenticated communication devices, a mutual communication between the communication devices having same pseudorandom numbers in their IP addresses;
• and
• sharing, in each of the one or more authenticated communication devices, an irreversible compressibility function to generate the value.