### Literature Review Comparison
The objective was to investigate the cooperation dynamics and strategies between the sources and jammers to optimize the network performance. In [PERSON] et al. [50], the focus was on a cooperation scenario between primary users (PUs) and untrusted secondary users (SUs) in cognitive radio networks. The SUs were willing to assist the PUs by relaying their messages in exchange for sharing the PUs' spectrum. However, a concern arose regarding the PUs' reluctance to accept this assistance due tothe untrustworthiness of the SUs, which may attempt unauthorized decoding of the PUs' messages. The study aimed to address the challenges and trade-offs associated with the cooperation between PUs and untrusted SUs in order to establish secure and efficient communication in cognitive radio networks. A distributed mechanism to improve the secrecy rate using CJs without a relaying network was investigated in [48], where the eavesdropper is considered to be an outside entity. CJs access the spectrum allocated to them simultaneously, which may cause significant interference to all CJs. The scheme in [48] was extended to the case where the eavesdropper is considered to be an untrusted AF relay (UR) in [51] and a single CJ is used. We will refer to the scheme in [48] as the Cooperative Jamming-based Simultaneous Transmission (CJST) scheme and to the untrusted relaying-aided CJST scheme in [51] as UR-CJST throughout the paper. A secure cooperative network consisting of a source, a destination, a group of untrusted AF relays and a passive eavesdropper whose location was unknown was proposed in [52]. The joint cooperative beamforming, jamming and power allocation strategy was considered to protect the confidential information while at the same time satisfying the required QoS at the destination. In [53], an untrusted relay is considered for enabling secure device-to-device communication by deploying a directional-dedicated jammer. As the jammer is directional, its impact is only on the untrusted relay but not on the destination device. In [54], a trusted relay employing an external eavesdropper is considered, and the impact of the relay, jammer and eavesdropper locations on the secrecy capacity is presented. Dedicated jamming nodes are beneficial in terms of improving the secrecy rate, but it would incur an additional burden on the existing infrastructure; therefore, non-altruistic solutions are financially more beneficial. Against this backdrop, in this contribution, we investigate the employment of non-altruistic multiple CJs for an untrusted relaying case and further propose a time-division transmission scenario, where all CJs access their dedicated channels in a time-division fashion. A literature review comparison is summarized in Table 1. In addition, we present a classification structure in Figure 1, which classifies the cited contributions for security in the communication networks presented in Table 1. More explicitly, our contributions are stated in the novelty statement below:  
1. We investigate the secrecy rate of the PU and the utility rate of the CJs/SUs, based on the locations of the CJs for the AF-based untrusted relaying case. 2. The model of the Stackelberg game between PU and CJs, as well as that of the power control game among CJs, are derived and investigated when an untrusted relaying terminal is employed. 3. We extend the CJST scheme in [48] to the case where the eavesdropper is considered to be an untrusted relay. We further extend the single CJ-assisted UR-CJST scheme [51] to multiple CJs, which we refer to as Untrusted Relaying-aided Multiple Cooperative Jammers-based Simultaneous Transmission (UR-MCJST). 4. Finally, an Untrusted Relaying-aided Multiple Cooperative Jammers-based Time-Division Transmission (UR-MCJTDT) scheme is proposed, where time division is considered in the utility phase. The performances of both UR-MCJST and UR-MCJTDT schemes are investigated. The outline of the paper is as follows.