Abstract
In hasty growth of communication, security plays a central role in maintaining confidentiality of data in group communication. Keeping the data intended for the group in confidential manner is the most important security feature need to be sustained for the group communication. An efficient group key management mechanism named as Hybrid Broadcast Group Management Protocol (HBGMP) is devised based on the Reverse Function (RF) and Chinese Remainder Theorem (CRT). The distinctive security among the subgroups is ensured by the reverse function and the session ID of each subgroup is calculated by employing Chinese remainder theorem. By contraption, the Session ID using Chinese Remainder Theorem, with which a cohort of n users requires Sub Group Service Provider (SGSP) to do O (n/m) computation for communication and the storage cost are diminished by diverting the computing load of the Group Service Provider (GSP) into the SGSP. The significance of this protocol is the group member needs to store only two different values during the entire life span and also the rekey message is broadcasted which brings down the communication cost to O(1). The protocol is defined generally for any applications in hybrid architecture. The proposed architecture using CRT and Reverse function is scalable for hefty sized dynamically changing group.
Highlights
The vital problem in group oriented applications is to guarantee the confidentiality
The evicted members cannot access the information of future group transactions is called forward secrecy and the joining members cannot access the information of past group transactions is called backward secrecy
A hybrid broadcast group management protocol based on Chinese Remainder Theorem (CRT) and reverse function is implemented which is very scalable for large size dynamically changing group
Summary
The vital problem in group oriented applications is to guarantee the confidentiality. The clandestineness of a broadcast communication session is normally ensured using a cryptographic mechanism. A common key known as group key is shared among the authorized group members in a broadcast group which is used to encrypt and decrypt the messages. The group membership is dynamic, i.e., in broadcast session the new members are authorized to join while some existing may be evicted. In order to ensure the forward and backward secrecy, the group key is to be updated and the new group is to be distributed only to the members of the group. In the group communication, unicast or multicast methods are adopted to deliver the new session key which may impose communication overhead. It is a challenging task to distribute the group key in an efficient and scalable way
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