The study on the physical layer security of NOMA system considers the worst case of eavesdropping under the IRS-assisted single-user cluster NOMA system model,that is,the untrusted internal near-end user tries to steal the information of the far-end user.For single-user cluster NOMA systems,a secure transmission scheme against internal eavesdropping based on IRS and artificial noise was proposed,which effectively improved the system's secrecy rate and reduced the probability of secure communication interruption.And an alternating optimization algorithm for joint beamforming,IRS reflection phase,and power allocation coefficients was proposed.The effectiveness of the algorithm is demonstrated through numerical simulation analysis,which improves the system's secrecy performance.
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