Method for generating and authenticating address automatically in IPv6-based internet and data structure thereof

A method for automatically generating an address in the IPv6-based Internet when a sender having a pair of a public key and a private key establishes a network connection, the method comprising:

• generating a CGA address and a CGA option based on the public key and a predetermined parameter;
• generating a signature option for verifying the CGA option;
• additionally generating a timestamp option in a case where a unidirectional message is transmitted to the network, and additionally generating a nonce option containing random numbers in a case where a bidirectional message is transmitted to the network;
• and
• adding the signature option, the timestamp option and the nonce option to a Neighbor Discovery (ND) option field to form an ND message, and transmitting the ND message to the network.

A method for authenticating an IPv6 address generated by a sender that has received an IPv6 message with a timestamp/nonce option, a signature option, and a CGA option added thereto, the method comprising:

• verifying a timestamp/nonce option;
• if the verifying of the timestamp/nonce option is successfully completed, checking the message whether it is a bidirectional message or a unidirectional message, and verifying the nonce option for the bidirectional message or verifying the signature option for the unidirectional message;
• and
• if the verifying of the time stamp is successfully completed, verifying the CGA option to check a CGA address, and authenticating the IPv6 address.