Abstract: Privacy security of multiuser on multilevel system is considered in this work. On communication there is a chance for the eavesdropper's to secretly listen to the conversation. In order to confuse the eavesdropper's, the transmitter sends information signal to both the receiver and eavesdropper. But the orginal message is send to the receiver and the information signal which looks same as the original message is send to the eavesdropper. The existing system says that if the eavesdropper is of lower quality than the transmitter that is transmitter having higher quality then it is easy for the transmitter to avoid the interface and send the information safely.
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