With future network equipment the security service becomes a critical and serious problem. Especially in the network, users do not want to expose their message to others or to be forged by others. They make extensive use of cryptography and integrity algorithms to achieve security. The sender can achieve the high quality of security service (high security level), only if the receivers and routers along path to receivers can support or satisfy the quality of security service requested by the sender. Therefore, this paper proposes a protocol to provide the needed mechanism for quality of security service, to dynamically negotiate the quality of security service among the senders and receivers of multicasts in the network. It provides different quality of security service resolutions to different receiver nodes with different security service needs and includes six different negotiation styles.
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