COMMUNICATION DEVICE, KEY-DATA UPDATING METHOD, AND KEY-DATA UPDATING PROCESS PROGRAM

摘要

The present invention provides a kind of communication equipments, key-data update method, and key-data renewal process, program, which can be carried out, updates safely and simply key data, such as encryption key. Communication equipment T1 and communication equipment T2 have stored identical table of random number, it is safely updated as needed with random table only by sending and receiving index, communication equipment T1 and communication equipment T2 is safely updated as desired by sending and receiving index between the encryption key.