Method and arrangement for implementing ipsec policy management using filter code

(57) Summary data processing equipment performs a security protocol based on data processing in the form of a packet. A packet handler (301) for data processing equipment to save a filter code (304), and process a data packet according to the saved filter code, It consists of policy management equipment (305) for transmitting the filter code created by creating a filter code to the above-mentioned packet handler (301). It is inspected whether a packet handler (301) is applicable to processing of a fixed packet with the saved filter code. When the saved filter code cannot apply to packet processing, the packet is transmitted to the above-mentioned policy management equipment (305), a filter code applicable to processing of a packet there is created, and the created filter code is transmitted to the above-mentioned packet handler (301).