Multicast establishes a group communication,rnwhere one sender can transmit the same message to multiple receivers.rnMulticasting makes this transmission efficient by making the client to sendrnjust one copy. But secure transmission in the multicast environment is a majorrnissue it should maintain the authentication, non-repudiation and integrity of messages.rnFor this we have created a multicast environment which ensures all thesernproperties by applying digital signature for authentication by signing thernmessages by private key of sender and using more secure hash algorithm SHA-192rnfor improving integrity of messages.