Multi-User Multi-Key Image Steganography with Key Isolation
This work addresses a critical security problem for multi-user image steganography applications, though it is incremental as it extends an existing method.
The paper tackles the limitation of single-user steganography in PUSNet by proposing PUSNet-MK, a multi-key extension that enforces key isolation to prevent cross-key decoding, resulting in high-quality stego images and accurate secret recovery without unintended leakage.
Steganography conceals secret information within innocuous carriers while preserving visual fidelity and enabling reliable recovery. Recent unified networks operate normally under untriggered conditions but switch to hidden steganographic tasks when triggered. PUSNet follows this paradigm by performing image purification during normal operation and steganographic embedding when activated. However, it supports only a single user with one key pair, limiting its applicability in multi-user settings. We propose PUSNet-MK, a multi-key extension that enforces strict key isolation via a mismatched-key isolation loss, effectively preventing cross-key decoding when a wrong key is applied. This design preserves the intended steganographic behavior while addressing a critical security limitation of PUSNet. Extensive experiments demonstrate that PUSNet-MK produces high-quality stego images and accurate secret recovery, while preventing unintended information leakage.