Secure communication system and method of IPv4/IPv6 integrated network system

An Internet Protocol version 4/Internet Protocol version 6 (IPv4/IPv6) integrated network system, comprising:

• at least one IPv4 node to create first identification information identifying at least one secret key shared between the at least one IPv4 node and at least one IPv6 node, and to exchange the first identification information with the at least one IPv6 node in a secure negotiating process based on an Internet Key Exchange (IKE);
• and
• the at least one IPv6 node to create second identification information identifying the at least one shared secret key, to exchange the second identification information with the at least one IPv4 node, and to perform the secure negotiating process using the at least one shared secret key corresponding to the first identification information and the second identification information exchanged in the secure negotiating process,
• wherein each of the first identification information and the second identification information comprises a lower 32-bit value corresponding to a key value of the respective shared secret key processed by means of a hash function, and
• wherein each of the at least one IPv4 node or the at least one IPv6 node sets a payload value indicating the respective identification information among reserved next payload values for a Next Payload field, and transmits the respective identification information by means of an Internet Key Exchange (IKE) payload in which the respective identification information is set for the Next Payload field.

A secure communication method of an Internet Protocol version 4/Internet Protocol version 6 (IPv4/IPv6)integrated network system, the secure communication method comprising:

• sharing, by a first node in a first Internet Protocol (IP) network and a second node in a second IP network different from the first IP network, a value of a secret key;
• creating, by the first node and the second node, KEY-IDs identifying the shared secret key value;
• and
• exchanging, by the first node and the second node, the KEY-IDs to perform a secure negotiating process,
• wherein creating comprises setting, to each of the KEY IDs, a lower 32-bit value which is a result value corresponding to a respective shared secret key value processed by means of a hash function, and
• wherein the first node or the second node sets a payload value indicating the respective KEY-ID among reserved next payload values for a Next Payload field, and transmits the respective KEY-ID by means of an Internet Key Exchange (IKE) payload in which the respective KEY-ID is set for the Next Payload field.

A secure communication method of an Internet Protocol version 4/Internet Protocol version 6 (IPv4/IPv6) integrated network system, the secure communication method comprising:

• sharing, by an IPv6 node and an IPv4 node, a value of a secret key;
• creating, by the IPv6 node and the IPv4 node, identification information identifying the secret key value;
• exchanging, by the IPv6 node and the IPv4 node, the identification information in a secure negotiating process based on an Internet Key Exchange (IKE);
• and
• performing, by the IPv6 node and the IPv4 node, the secure negotiating process based on the secret key corresponding to the identification information,
• wherein creating comprises setting, to the identification information, a lower 32-bit value which is a result value corresponding to a respective shared secret key value processed by means of a hash function, and
• wherein the IPv4 node or the IPv6 node sets a payload value indicating the respective identification information among reserved next payload values for a Next Payload field, and transmits the respective identification information by means of an Internet Key Exchange (IKE) payload in which the respective identification information is set for the Next Payload field.