中文摘要：

There are various challenges that are faced in group communication, so it is necessary to ensure session key. Key agreement is the fundamental cryptographic primitive for establishing a secure communication. It is a process of computing a shared secret contributed by two or more entities such that no single node can predetermine the resulting value. An authenticated key agreement is attained by combining the key agreement protocol with digital signatures. After a brief introduction to existing key agreement in group communication, Making use of the additive-multiplicative homomorphism in the integer ring defined by Sander and Tschudin: A new protocols, called the homomorphism key agreement, was designed, which can be self-contributory, robust, scalable and applicable in group communication.

英文摘要：

There are various challenges that are faced in group communication, so it isnecessary to ensure session key. Key agreement is the fundamental cryptographic primitive forestablishing a secure communication. It is a process of computing a shared secret contributed by twoor more entities such that no single node can predetermine the resulting value. An authenticatedkey agreement is attained by combining the key agreement protocol with digital signatures. After abrief introduction to existing key agreement in group communication, Making use of theadditive-multiplicative homomorphism in the integer ring defined by Sander and Tschudin: A newprotocols, called the homomorphism key agreement, was designed, which can be self-contributory,robust, scalable and applicable in group communication.