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The protocol of this scheme consists of 3 steps.
Step 1. All SNs register to KDC, and KDC responds with Step 2.
Step 2 Each node in the group obtains a polynomial and a random number which will later be used to form the group key shared by KDC.
Step 3. Then, each node inputs the random number into the obtained polynomial to obtain the session key. In the next stage, each node generates a secret input and distributes it to other nodes in the same group. An XOR operation between the session key and the secret input generates the secret key. Then, use XOR between the secret key obtained and the session key to return each user¡¯s secret input. At this stage, each node has all the secret inputs from nodes in the same group. So, calculating the group key is done by XOR for all the secret inputs. This group key is used for communication between groups.
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IEEE/ICACT20230044 Slide.08
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