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The evolution of diverse Intenet-of-things (IoT) applications towards Industry 5.0 has recently increased challenges in physical-layer security. In particular, short-packet communication (SPC) and non-orthogonal multiple access (NOMA) are being thoroughly integrated into IoT networks to achieve ultra-reliable low-latency communication (URLLC) applications and users' massive connectivity. Nevertheless, this creates a critical security flaw when untrusted-near users (NUs), using the same resource block as far users (FUs), can readily intercept FU's information with conventional NOMA. To mitigate such security threats, we propose a modified power allocation integrated beamforming (MPAIB) scheme to carry out the pairing procedure for SPC-enabled NOMA systems with multiple untrusted NUs. This scheme can simultaneously achieve joint objectives of preventing entrusted FU's leakage information and enhancing …