In many organizations distributed information sharing is used to share data in a large network. In distributed Information sharing there are many chances to hack the technical and personal information of client and server in a network. Earlier Information Brokering methods are used where brokers are used to share the information among the clients and servers. This approach has a drawback where the brokers cannot be trusted to share information. In this paper we propose a technique to preserve the security and privacy of the distributed network where information is shared. We also use a shared medium as an interface between the server and client. AES encryption is used to encrypt the information in server which is to be sent to the client. In shared medium we use Digital Signature Algorithm to perform client authentication to send the information to the requested client. Genetic Algorithm is another technique which is used to detect the attackers who tries to hack the information in shared medium. Since we use two cryptographic techniques the security maintained will be high. Use of Genetic Algorithm also enhances the security measures of the system and it will be difficult for attackers to hack the information easily. We use the above three techniques to improve the performance measure.