Method and apparatus for identifying cga public key, and method, apparatus, and system for determining cga public key

A network node for determining a Cryptographically Generated Address (CGA) public key, wherein the network node works with another network node to determine a CGA public key and comprises:

• a public key selecting module (101), configured to select at least one candidate public key as a public key to be determined among N candidate public keys deployed on the network node, wherein N is a positive integer;
• a first message processing module (102), configured to use the public key selected by the public key selecting module (101) to protect a first message;
• a first message sending module (103), configured to send the first message to the another network node;
• a first public key obtaining module (104), configured to obtain a type of the public key to be determined according to a second message sent by the another network node;
• and
• a public key negotiating and determining module (105), configured to use the public key to be determined as a public key determined through negotiation with the another network node according to the type of the public key obtained by the first public key obtaining module (104).

A network node for determining a Cryptographically Generated Address (CGA) public key, wherein the network node works with another network node to determine a CGA public key and comprises:

• a second message receiving module (111), configured to receive a first message protected using a public key to be determined from the another network node;
• a second public key obtaining module (112), configured to obtain a type of the public key to be determined according to the first message;
• and
• a public key judging module (113), configured to determine whether the public key to be determined is supported by the network node according to the type of the public key to be determined, and, if the public key to be determined is supported by the network node, determine the public key as a public key supported by the network node.