Setup Protocol. The members who want to form a group can be ordered according to some criteria such as MAC address of device. The structure of the key tree can be then derived from this order. The first member in the order is selected as director. The i blinded key of member Mi is BKi = si βr β s where βr is existing publish braid word at root node before the director will update next member to key tree by order. Each member knows the own βr because it have some criteria such as MAC address of all members. It can order the MAC address by itself, and then it knows sequence of members. After the director received blinded key from each member sends, it create key tree and computes keys and blinded keys of intermediate node in key tree. Later the director broadcasts the key tree to all members in the group. The process is illustrated as follows:
Setup Protocol. The members who want to form a group can be ordered according to some criteria such as MAC address of device same as the previous protocol. The structure of the key tree can be then derived from this order. The first member in the order is selected as director. The blinded key of member Mi is BKi = si βr β s where βr is existing publish braid word at root node before the director will update next member to key tree by order. Each member knows the own βr because it has some criteria such as MAC address of all members. It can order the MAC address by itself, and then it knows sequence of member. Each member sends its authenticated blinded key according to director. For example, M5 sends authenticated blinded key as k5BK5 k-1 where k5 is x5Pd x-1, x5 is M5’s long term private key and Pd is director’s long term public key. The process is illustrated as follows:
