NETWORK SYSTEM FOR SECRET COMMUNICATION

摘要

PURPOSE:To obtain a secret communication network system easily applicable to a system having complex certification by providing each terminal itself with a means for generating a certified open key using a party's ID and terminal information issued by the information center. CONSTITUTION:Let center's open information items q, g, h, and Pa be defined as a large elementary number for q, original root for g, hash function for h, and gmodq for Pa, and let Sa be the secret key for the center. Further, let secret key for terminal i be represented with Si, and open key with PiidenticalgSmodq, and terminal information be represented with uaiidenticalgXPi modq, and vaiidenticalh (uai, IDi)XSa+rai mod(q-1). After that, terminal receives terminal information uai, vai, and IDi from terminal i, and then open key for terminal i uses an open key generating means obtained by PiidenticalPa (uaiIDXvaiXg<-vai>modq).