Abstract: In most of the emerging networks the main problem is based on broadcasting a data to a remote cooperative group in efficient and secure manner. To overcome the limited communication from the group to the sender, the unavailability of fully trusted key generation center and the dynamics of the sender we proposing a hybrid of traditional broadcast encryption and group key agreement. In this system, each member maintains a single public/secret key pair. When seeing the public keys of the members, a remote sender can securely broadcast to any subgroup. Following this model, we introduce a scheme that is proven secure in the standard model. In this, even if non-intended members collude, they cannot extract any useful information from the transmitted messages. After the public group encryption key is extracted, both the computation overhead and the communication cost are independent of the group size. It is very strong security against collusion, constant overhead, and also our protocol is a solution to many applications.