Encryption processing method and encryption processing device

A encrypt processing apparatus for improving encrypt and decrypting processing or authentication processing for multimedia communication secured by a security protocol, the encrypt processing apparatus comprising:

• a storing section that stores secure processing information including an identification condition for identifying a packet required in the encrypt and decrypting processing or the authentication processing;
• a transmitting section that transmits a plaintext multimedia packet to a virtual network interface;
• a modification section that modifies a payload of a secure multimedia packet such that the payload of the secure multimedia packet complies with a security protocol by deciding whether or not the plaintext multimedia packet matches the identification condition included in the secure processing information and executing encrypt processing or authentication processing for the plaintext multimedia packet when the identification condition is matched;
• a replacement section that transfers the secure multimedia packet to be transmitted to the virtual network interface, to an original network interface;
• and
• a transmitting section that transmits the secure multimedia packet from a network interface.

A encrypt processing method for improving encrypt and decrypting processing or authentication processing for multimedia communication secured by a security protocol, the encrypt processing method comprising the steps of:

• upon starting the multimedia communication, storing secure processing information including an identification condition for identifying a packet required in the encrypt and decrypting processing or the authentication processing;
• filtering a secure multimedia packet inputted in a network protocol stack, based on the identification condition included in the secure processing information;
• in a case where the secure multimedia packet is filtered, when the secure multimedia packet matches the identification condition included in the secure processing information, executing decrypting processing or authentication processing for the secure multimedia packet and modifying a payload of the secure multimedia packet as a plaintext payload;
• and
• transmitting a plaintext multimedia packet to an application layer of the multimedia communication.

A encrypt processing apparatus for improving encrypt and decrypting processing or authentication processing for multimedia communication secured by a security protocol, the encrypt processing apparatus comprising:

• a storing section that stores secure processing information including an identification condition for identifying a packet required in the encrypt and decrypting processing or the authentication processing;
• a modification section for modifying a payload of a secure multimedia packet as a plaintext payload by deciding whether or not the secure multimedia packet inputted matches the identification condition included in the secure processing information and executing encrypt processing or authentication processing for the secure multimedia packet when the identification condition is matched;
• and
• a transmitting section that transmits a plaintext multimedia packet to an application layer of the multimedia communication.