用真实密钥生成隐写对象，解决传统方法密钥频繁交换问题。
DDIM-Driven Coverless Steganography Scheme with Real Key
- 基于DDIM生成模型，结合可逆数据隐藏与混沌加密。
- 单次密钥协商支持多次通信，降低密钥管理开销。
- 密钥与秘密信息解耦，提升隐写安全性和实用性。
随着信息隐藏技术的发展，基于生成的无载体隐写技术成为传统方法的替代方案，利用生成模型将秘密信息转换为隐写对象，而非嵌入载体冗余中。然而，现有基于生成的方法需共享伪密钥，导致频繁密钥交换带来高开销，并因密钥与秘密信息紧密耦合而存在安全隐患。本文提出一种基于DDIM的无载体隐写方案，采用真实密钥机制，优化密钥管理。通过在生成模型中集成可逆数据隐藏（RDH）和混沌加密，该方法消除了频繁密钥交换，降低了密钥与秘密信息的相关性。此外，仅需一次密钥协商即可支持多次通信，显著降低开销。实验结果表明，该方案能有效抵御替换攻击，提升隐蔽通信的安全性。
原文摘要 · Abstract (English)
With the advancement of information hiding techniques, generation-based coverless steganography has emerged as an alternative to traditional methods, leveraging generative models to transform secret information into stego-objects rather than embedding it within the redundancy of the cover. However, existing generation-based approaches require pseudo-keys that must be shared between communication parties, leading to high overhead of frequent key exchanges and security risks due to their tight coupling with the secret information. This paper proposes a DDIM-driven coverless steganography scheme that utilizes a real-key mechanism, improving the key management. By integrating reversible data hiding (RDH) and chaotic encryption into generation model, the proposed method eliminates excessive key exchanges and reduces the correlation between the key and the secret information. Furthermore, it requires only a single key negotiation for multiple communication, which lowers overhead. Experimental results demonstrate that the proposed scheme resists substitution attacks, enhancing the security of covert communication.
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