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This paper studies a trade-off between security (intercept probability (IP)) and reliability (outage probability (OP)) for a multi-hop decode-and-forward (DF) relaying protocol in an underlay cognitive radio network, in presence of a multi-antenna eavesdropper. In the considered protocol, all primary and secondary terminals are equipped with multiple antennas, and they employ transmit antenna selection (TAS) (at transmitter sides) and selection combining (SC) (at receiver sides) techniques todoi:10.25046/aj050508 fatcat:a566pvlgizandd7p5h4jhc4wja