A Secure Key Transfer Protocol for Group Communication
Advanced Computing An International Journal
Providing security for messages in group communication is more essential and critical nowadays. In group oriented applications such as Video conferencing and entertainment applications, it is necessary to secure the confidential data in such a way that intruders are not able to modify or transmit the data. Key transfer protocols fully rely on trusted Key Generation Center (KGC) to compute group key and to transport the group keys to all communication parties in a secured and secret manner. In
... secret manner. In this paper, an efficient key generation and key transfer protocol has been proposed where KGC can broadcast group key information to all group members in a secure way. Hence, only authorized group members will be able to retrieve the secret key and unauthorized members cannot retrieve the secret key. Hence, inorder to maintain the forward and backward secrecy, the group keys are updated whenever a new member joins or leaves the communication group. The proposed algorithm is more efficient and relies on NP class. In addition, the keys are distributed to the group users in a safe and secure way. Moreover, the key generated is also very strong since it uses cryptographic techniques which provide efficient computation. 84 communicating information with the group members by sharing one or more secret key during registration. But in key agreement protocols, the group key is determined by exchanging public keys of two communication parties with the presence of communication entities. The most commonly used key agreement protocol in the existing work is Diffie-Hellman (DH) key agreement protocol  . However, the Diffie Hellman key distribution algorithm is limited to provide secret key only for two entities, and cannot provide secret keys for the group that has more than two members. When there are a more number of members in a group the time delay for setting up the group key will take longer time. Hence, it is necessary to propose a new technique to avoid this type of constraints in group communication. In this proposed work, group communication applications will make use of key transfer protocol to transmit data to all the group members with the minimum resources needed for this group communication. In the existing approach, the distributed group key management protocol does not have the group controller that controls the users in the group for secure group communication. Also, the processing time and communication requirements increase when the number of users increases in the group. Hence, it is necessary to propose a new technique that ensures the group communication among the group using forward secrecy and backward secrecy, while avoiding the existing overheads. Moreover, the members joining and leaving the group are efficiently managed by encrypted key. Since, the key is generated and maintained for each member in a group the confidentiality and security of the data in group communication is guaranteed. Also, the computation time of the message distribution and key extraction from the message is fast, when compared with the existing work.