This paper studies the secure transmission in the dual-hop cognitive wiretap networks. where the secondary transmitter (Alice) aims to transmit confidential information to the secondary receiver (Bob) in the face of a multi-antenna relay (Relay). while the malicious eavesdropper (Eve) is used to eavesdrop the confidential information from Alice and Relay. To improve security. https://pipingrockers.shop/product-category/symbiotropin/