arXiv2026
Secure covert communication across multiple observable channels requires concealing both the transmitted objects and the relationships among them while resisting active manipulation. This paper introduces a cover-parameterised multichannel hybrid steganographic framework that combines message-independent cover synthesis with adaptive cover modification. Synthesised cover-parameter objects condition a keyed QIM-style mask, and the resulting masked payload is embedded into an existing image using QIM-Fused-CF, which integrates fused S-UNIWARD/MiPOD distortion costs, complexity-aware region refinement, SLIC-guided constraints, and syndrome-trellis coding. The protocol distributes each authenticated epoch across three channels and incorporates freshness verification, bounded scheduling, synchronisation, and re-synchronisation. We formalise cover-parameter indistinguishability $(\textsf{CP-IND})$ and unlinkability $(\textsf{CP-UNL})$, multichannel trace indistinguishability $(\textsf{IND-STEGO-MC})$, and an active $\textsf{MC-ATTACK}$ model covering message recovery, replay, and authenticated substitution. The resulting bounds separate masking, embedding, scheduling, authentication, and receiver-state contributions. Experiments on 10,000 BOSSBase images achieve zero bit-error rate for all valid embeddings and structural similarity above $0.9995$ across payloads of $0.10$--$0.40$~bpp. At $0.10$ and $0.20$~bpp, SRM+EC, Ye-Net, and Yedroudj-Net produce AUC values of $0.5017$--$0.5444$ and $0.5424$--$0.5678$, respectively, whereas detectability increases substantially at $0.40$~bpp. These results identify a practical low-to-moderate-payload operating region and demonstrate that secure multichannel steganography requires the joint design of synthesis, masking, embedding, scheduling, authentication, and receiver state.