LOADING OF PAIR KEY IN KEY MANAGEMENT SYSTEM, ACHIEVEMENT OF COMPLETE SECRET TRANSFER IN CLOSED USER GROUP, METHOD FOR DATAGRAM MULTICAST TRANSMISSION AND DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a method and device for achieving complete secret transfer in a closed user group through a one-directional function application for a concealed pair system security value in each node. ;SOLUTION: A first node I 22 and a second node J 30 are connected with other exclusive networks connected with an internet 20. A specific security value, public value, and context variable N_i are applied to each node 22 and 30. Each node 22 and 30 obtained a certificate related with the other node, and obtains the public value of the other node from the certificate. Each node 22 and 30 in the closed user group preliminarily calculates all shared security values for each closed group, and deletes its own security value. When an N value is incremented, each node can calculate [k_ij]N related with the arbitrary N value without re-calculating the shared security value.;COPYRIGHT: (C)1999,JPO